F(X)=(1-2X)(2X+1) найдите f'(0.5)

Question

F(X)=(1-2X)(2X+1) найдите f'(0.5)

Answer 1

F(x)=(1-2x)(2x+1)=(1-2x)(1+2x)=1-4x²;
f¹(x)=-8x;
f¹(0.5)=-8·0.5=-4;