Question

When solving a problem, two students fell back on a 2nd degree equation, however, when solving it, they both made a mistake. The 1st student only got the independent term of the equation wrong, finding the roots -10 and -2. The 2nd student only got the coefficient of the 1st degree term wrong, finding roots 4 and 8. Were the correct roots of the equation?

236

likes
1182 views

Answer to a math question When solving a problem, two students fell back on a 2nd degree equation, however, when solving it, they both made a mistake. The 1st student only got the independent term of the equation wrong, finding the roots -10 and -2. The 2nd student only got the coefficient of the 1st degree term wrong, finding roots 4 and 8. Were the correct roots of the equation?

Expert avatar
Santino
4.5
112 Answers
Com certeza, vamos descobrir as raízes corretas da equação quadrática! Veja como podemos abordar isso: **Compreendendo as informações** * **Aluno 1:** Errou no termo constante (termo independente). Suas raízes são -10 e -2. * **Aluno 2:** Errou no coeficiente do termo x. Suas raízes são 4 e 8. **Usando as propriedades das raízes** 1. **Soma das Raízes:** Em uma equação quadrática *ax² + bx + c = 0*, a soma das raízes é igual a *-b/a*. 2. **Produto das Raízes:** Em uma equação quadrática *ax² + bx + c = 0*, o produto das raízes é igual a *c/a*. **Vamos analisar:** * **Aluno 1:** * Produto de suas raízes: (-10) * (-2) = 20. Este pode ser o *c/a* correto. * **Aluno 2:** * Soma de suas raízes: 4 + 8 = 12. Este poderia ser o *-b/a* correto. **Encontrando a equação correta:** Vamos supor que a equação quadrática correta seja *x² + bx + c = 0*. (Definiremos a = 1 para simplificar). * Do Aluno 2, temos -b/1 = 12, então b = -12 * Do Aluno 1, temos c/1 = 20, então c = 20 **A equação correta:** x² - 12x + 20 = 0 **Encontrando as raízes corretas** Podemos resolver esta equação quadrática usando fatoração ou a fórmula quadrática: (x - 10) (x - 2) = 0 Portanto, as raízes corretas são x = 10 e x = 2. **Conclusão:** As raízes corretas da equação eram 10 e 2.

Frequently asked questions (FAQs)
Math question: Find the factors of 36 using the Factoring formula.
+
What is the difference between the values of the exponential functions f(x) = 10^x and g(x) = e^x, when x = 2?
+
Question: In a circle with center O, if ∠AOC = 120° and ∠ABC = 70°, what is the measure of ∠BOC?
+
New questions in Mathematics
I want to divide R$ 2200.00 between Antônio, Beto and Cássia, so that Beto receives half from Antônio and Cássia receives a third of Beto. Under these conditions, how much more will Beto receive than Cássia?
Use the digits of 1,9,2,3 to come up with all the numbers 98 and 95
The data set (75, 85, 58, 72, 70, 75) is a random sample from the normal distribution No(µ, σ). Determine a 95% two-sided confidence interval for the mean µ .
Which of the following is the product of multiplying twenty-seven and twenty-five hundredths by nine and twenty-seven hundredths?
1. Suppose we have a good whose quantity supplied changed from 100 to 120 units when the price increased from $10 to $12 per unit. Compute the price elasticity of supply using the midpoint method
Moaz wanted to test whether the level of headache pain (on a scale of 1 – 10) changes after taking Advil. He collected data from 9 participants and calculated the difference in headache pain before and after taking Advil (summarized in the table below). Determine W observed for this test. Difference Scores -2 -4 0 +1 +3 -2 0 -3 -5 Also, What is the degrees of freedom for this test?
An integer is taken at random from the first 40 positive integers. What is the probability that the integer is divisible by 5 or 6?
Solve this mathematical problem if 3/5 of a roll of tape measures 2m. How long is the complete roll? Draw the diagram
There were no defectives in a sample of 1 light bulb does this sample provide sufficient evidence that in the warehouse with millions of light bulbs fewer than 10% are defective?
During a fishing trip Alex notices that the height h of the tide (in metres) is given by h=1−(1/2)*cos(πt/6) where t is measued in hours from the start of the trip. (a) Enter the exact value of h at the start of the trip in the box below.
A triangular window has a base of 6 ft. and a height of 7 ft. What is its area?
Use a pattern approach to explain why (-2)(-3)=6
2)A tourist has 15 pairs of pants in his hotel room closet. Suppose 5 are blue and the rest are black. The tourist leaves his room twice a day. He takes a pair of pants and puts them on, the tourist leaves the first pair of pants in the closet again and takes another one and puts them on. What is the probability that the two pants chosen are black?
Quadratic equation 2X = 15/X + 7
Solve equations by equalization method X-8=-2y 2x+y=7
How do you convert a fraction to a decimal
Given a circle 𝑘(𝑆; 𝑟 = 4 𝑐𝑚) and a line |𝐴𝐵| = 2 𝑐𝑚. Determine and construct the set of all centers of circles that touch circle 𝑘 and have radius 𝑟 = |𝐴𝐵|
8. Measurement Jillian measured the distance around a small fish pond to be 27 yards. What would be a good estimate of the distance across the pond: 14 yards, 9 yards, or 7 yards? Explain how you decided.
The length of a rectangle is five more than its width. if the perimeter is 120, find both the length and the width.
Let f(x)=-1/2x+5 evaluate f(-6)