Question

a forma fatorada de
${2}^{2} - 50$

é?
a) ( 2x+5).(5-x)
b) (x+5).(x-5)
c) (2x+5).(2x+5)
d) 2(x+5).(x-5)
e) 2(x+5).(x-5)

Answer 1

$2x^2-50=2\cdot(x^2-25)=2\cdot(x+5)\cdot(x-5)$

Resposta: D ou E (ambas possuem a mesma resposta).