Question

Factorise:- 4x raised to the power 4+7xsquare - 2

Answer 1

Then you'd be expected to back-substitute the "x2" for the "y" to get:

(x2 – 4)(x2 + 2)
The entire process would look like this:

x4 – 2x2 – 8

(x2)2 – 2(x2) – 8

y2 – 2y – 8

(y – 4)(y + 2)

(x2 – 4)(x2 + 2)

Answer 2

$4x \times 4 + {7x}^{ - 2}$
4x×7x = 4
28x / 4
7