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(f°g)(x) = f(g(x))
= 2g(x)²-5g(x)+3
=2(2x+4)²-5(2x+4)+3
=2(4x²+16x+16)-10x-20+3
=8x²+32x+32-10x-20+3
=8x²+32x-10x+32-20+3
= 8x²+22x+15
jawabannya B