Question

3x²-2x+5, para x=-2/5​

Answer 1

Respuesta:

$3 {x}^{2} - 2x + 5 = \\ 3 \times {( - \frac{2}{5} )}^{2} - 2 \times ( - \frac{2}{5} ) + 5 = \\ 3 \times \frac{4}{25} - ( - \frac{4}{5} ) + 5 = \\ \frac{12}{25} + \frac{4}{5} + 5 = \\ \frac{12}{25} + \frac{20}{25} + \frac{125}{25} = \\ \frac{157}{25}$