8 + x 40 is not a valid mathematical expression.
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It is the expression 8 + x40, which cannot be evaluated without knowing the value of x.
x2 + 3x - 40 = x2 + 8x - 5x - 40 = x(x + 8) - 5(x + 8) = (x - 5)(x + 8)
8(x+5) is equivalent to 8x+40
ANSWER: 88(1/2)(8 x 12) + 40:= (1/2 x 96) + 40= 88
(x - 5)(x - 8)
40