Question

(a+bx)(a-bx)=25x-4x^3 find the value of b^-a

Answer 1

25x - 4x³ can be rewritten as:

x(25 - 4x²) = x(5 + 2x)(5 - 2x)

Therefore a = 5 & b = 2

b^-a = 1 / b^a = 1 / 2^5 = 1/32

Hope that helps