(2x-6)(x+3)
= 2x(x+3)-6(x+3)
= 2x^2+6x-6(x+3)
= 2x^2+6x-6x-18
= 2x^2-18
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Penyelesaian
(2x-6)(x+3)
= 2x(x+3)-6(x+3)
= 2x^2+6x-6(x+3)
= 2x^2+6x-6x-18
= 2x^2-18