Question

value of x in
Find the
9 2² x 4²
2​

Answer 1

2 (x - 2)^2 = 18

2 (x^2 -4x +4) = 18

2x^2 - 8x + 8 = 18

2x^2 - 8x + 8 - 18 = 0

2x^2 - 8x - 10 = 0

2 (x^2 - 4x - 5) = 0

x^2 - 4x - 5 = 0

Using the cross method*

1 ………... -5 / -5

1 …………. 1 / 1

………………/ -4

Therefore:

x - 5 = 0 … x + 1 = 0

x = 5 … … x = -1