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(gof)(x) = g(f(x)) = x^2 -2x+4
= (2x+3)^2 -2(2x+3)+4
= 4x^2 +12x+9 -4x-6+4
= 4x^2 + 8x +7
(gof)(-2) = 4x^2 + 8x +7
= 4(-2)^2 + 8(-2) +7
= 4(4) -16 +7
=16-16+7
= 7