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16x2-9
4x = 3y + 9, y = x + 1. 4x = 3(x + 1) + 9 4x = 3x + 3 + 9 x = 12. y = 13.
(2x - 3)(4x + 9)(2x + 3) = (2x - 3)(2x + 3)(4x + 9) = [(2x)^2 - (3^2)](4x + 9) = (4x^2 - 9)(4x + 9) = (4x^2)(4x) + (4x^2)(9) - (9)(4x) - (9)(9) = 16x^3 + 36 x^2 - 36x - 81
4x+5 = -9 4x = -9-5 4x = -14 x = -3.5
4x(7+9)= 28+36=64.