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Verified answer
F(x) = 2x^2 + x^2 - 5x-21f(x) = 3x^2 -5x -21
f'(x)= 6x-5
f'(1)=6(1)-5
f'(1)=6-5
=1
F(x)= 3x^2-5x-21
F'(x)=6x-5
F'(1)=6.1-5=1