f(x) = x^{2} + 5x, g(x) = 8x^{2} − 1

Find

f(x) = x2 + 5x, g(x) = 8x2 − 1

(f + g)(x) = f(x) +g(x) = 9x2 + 5x -1

domain of (f + g)(x). [-infinity,infinity]

(f − g)(x) = f(x) - g(x) = -7x2 + 5x +1

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

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