144 = (x+4)(3x+6)

Multiply and then simplify your answer
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1 Answer

144=3x²+18x+24, divide through by 3: 48=x²+6x+8, x²+6x-40=0=(x+10)(x-4).

So x=-10 or 4.

OR

Divide the original equation by 3:

48=(x+4)(x+2)=x²+6x+8, ...

by Top Rated User (1.1m points)

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