Question

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

Answer 1

The correct answer is D. on edg

Answer 2

`x= (-b+/- √(b^2-4ac) )/(2a)`

first solve for 0=ax^2+bx+c
-2=-x+x^2-4
add 2 to both sides
0=x^2-x-2
a=1
b=-1
c=-2


`x= (-(-1)+/- √((-1)^2-4(1)(-2)) )/(2(1))`

last one is answer