Question

Which shows the correct substitution of the values a, b, and c from the equation –2 = –x + x2 – 4 into the quadratic formula?

Quadratic formula: x =

Answer 1

D on edge

Explanation:

Answer 2

well realistically this problem could be completed without use of quadratic equation:

-2 = -x + 2x - 4
+4 +4
2 = x

However, for quadratic equation, there needs to be 3 numbers:

ax^2+bx+c=0

Putting the equation in this form, we can say that

(0)x^2+(1)x+(-2)=0

Taking that and putting it into the quad formula makes:

x=(-1+-sqrt((1)^2-4(0)(-2)))/2(0)

That makes it a divide by 0 problem, making it unsolveable