x ( x + 3 ) = 270
x2 + 3x - 270= 0
x2 + 18 x - 15x - 270 = 0
x (x-18) - 15 (x + 18) =0
(x-15) (x + 18) = 0
x =15 ò x = -18 .
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Verified answer
x ( x + 3 ) = 270
x2 + 3x - 270= 0
x2 + 18 x - 15x - 270 = 0
x (x-18) - 15 (x + 18) =0
(x-15) (x + 18) = 0
x =15 ò x = -18 .