f(x) = x^{2} + 5x, g(x) = 8x^{2} − 1

Find (fg)(x).

f(x) = x2 + 5x, g(x) = 8x2 − 1

(fg)(x). = f(8x2-1) = (8x2-1)^2+5(8x2-1) = 64x^4-16x^2+1+40x^2-5 = 64x^4+24x^2-4

(fg)(x). All Real Numbers i.e (-infinity, infinity)

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