Question

please help..... explain in steps

Use the technique of completing the square to transform the quadratic equation into the form (x + c)2 = a.

5x2 + 20x - 120 = 0

answer:
(x + 2)2 = 28 (x + 5)2 = -21
(x + 2)2 = -28 (x + 4)2 = 21

Answer 1

hmm, do you know how to find the axis of symmetry?

Answer 2

sadly no

Answer 3

never done this

Answer 4

well, if youve never done this then it can be a bit complicated.

Answer 5

its worth a shot :)

Answer 6

you can work backwards; see which option expands to the original