If you mean -3(x+5) = 8x+18 then -3x-15 = 8x+18 and the value of x works out as -3
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= (3x + 5)(x + 1) so x = -5/3 or -1
x - 3
8x + 5 = 25(- 5 from both sides)8x = 20(divide both sides by 8)x = 2.5
x2 + 8x - 5 = 0 ∴ x2 + 8x + 16 = 21 ∴ (x + 4)2 = 21 ∴ x + 4 = ± √21 ∴ x = -4 ± √21
Given f(x) = 8x + 5 So f(8) = 8 * 8 - 5 = 64 - 5 = 59