What do you do after you plug in the x+h
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f(x+h)=3(x+h)²+5(x+h)-2=3(x²+2xh+h²)+5(x+h)-2=

3x²+6xh+3h²+5x+5h-2=3x²+x(6h+5)+(3h²+5h-2).
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