x3 + 12x2 + 48x + 64
= (x + 4)(x2 + 8x + 16)
= (x + 4)(x + 4)(x + 4)
= (x + 4)3
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Normal rules mean x takes precedent over +, so you get 24 +4x. But if you mean 12(2+4x) then it's 24+48x
2(x + 5)(5x - 1)
$48x + 5y" is an expression. It is not a function and so cannot be written as a function.
X = 1.5
No answer in integers. Near approximation x = -0.09 or -1.24