Question

qual o valor numerico do plinomio : 4x²-2x²-x , para x = -1/2  ?

Answer 1

$4.(-\frac{1}{2})^2-2(-\frac{1}{2})^2-(-\frac{1}{2})=\\ \\ 4.\frac{1}{4}-2.(\frac{1}{4})+\frac{1}{2}=\\ \\ 1-\frac{1}{2}+\frac{1}{2}=1$