Question

Expand (5x - 2)4.

Answer 1

4*5x + 4 * -2

Answer 2

625x4 - 2000x3 + 600x2 - 160x + 16

625x4 - 1000x3 + 600x2 - 160x + 16

625x4 - 2000x3 + 1600x2 - 160x + 16

625x4 - 1000x3 + 1600x2 - 160x + 16

Answer 3

oh - 4 is the exponent!!!
to avoid ambiguity this is best written as (5x - 2)^4

you need to multiply (5x - 2) 4 times

Answer 4

(5x - 2)(5x - 2) = 25x^2 -10x - 10x + 4
= 25x^2 - 20x + 4)

(5x - 2)^4 = (25x^2 - 20x + 4)^2

Answer 5

you need to distribute 25x^2 , -20x and +4 over the second bracket