Question

Calcule o valor da expressão (x-1). (2x-1) para x = 1/2

Answer 1

Resposta:

Explicação passo-a-passo:

$\ \ \big(x-1\big)\cdot\big(2x-1\big)\\\\=\big(\frac{1}{2} -1\big)\cdot\big(2\cdot\frac{1}{2} -1\big)\\\\=\big(\frac{1}{2} -\frac{2}{2}\big)\cdot\big(\frac{2}{2} -1\big)\\\\=\big(\frac{1-2}{2}\big)\cdot\big(1-1\big)\\\\=\big(-\frac{1}{2}\big)\cdot0\\\\=0$