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f'(x) = - 2x - 3
f'(-2) = - 2(-2) - 3
f'(-2) = 24 + 4 - 3
f'(-2) = 25
=6x²-2x-3
f'(-2)=6(-2)²-2(-2)-3
=6.4-(-4)-3
=24+4-3=25