Question

Identify the values of a, b, and c that would be used in the quadratic

formula to solve the equation
- x2 + 5x = 7.


A) a = -1, b = 5, c = 0
B) a = 1, b = 5, c = 7
C) a = -1, b = 5, c = -7
D) a = 1, b = -5, c = 0​

Answer 1

a=-1, b=5 and c=-7

Explanation:

We have the following equation:

`-x^(2) + 5x = 7` →
`-x^(2) + 5x - 7 = 0`

Given the equation of a parabola:
`ax^(2) +bx + c = 0`. By comparison, we know that:

a=-1, b=5 and c=-7

So the correct option is Option C.

Answer 2

C) a= -1, b=5, c= -7

Explanation:

To get the values of a, b and c we must first write the equation in the form

ax²+bx+c=0 where a b and c are the coefficients.

Therefore, -x² +5x=7 can also be written as:

-x²+5x-7=0

a= -1 ( coefficient of x²)

b=5 (coefficient of x)

c= -7 ( the constant in the equation)