\(a,=\left(x-2\right)\left(x+2\right)+8\left(x+2\right)=\left(x+2\right)\left(x+6\right)\\ b,=\left(x-3y\right)^2-144=\left(x-3y-12\right)\left(x-3y+12\right)\)
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a. (x2 - 4) + 8(x + 2)
= (x + 2)(x - 2) + 8(x + 2)
= (x + 2)(x - 2 + 8)
= (x + 2)(x + 6)
b. x2 - 144 + 9y2 - 6xy
= x2 - 6xy + 9y2 - 144
= (x - 3y)2 - 122
= (x - 3y + 12)(x - 3y - 12)
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