(f o g ) (x) =f(g(x))
=f(2x+3)
=(2x+3)²-3(2x+3)-4
=4x²+12x+9-6x-9-4
=4x²+6x-4
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(f o g ) (x) =f(g(x))
=f(2x+3)
=(2x+3)²-3(2x+3)-4
=4x²+12x+9-6x-9-4
=4x²+6x-4