Question

responda rapidamente pvr​

Answer 1

Resposta:

a) a soma de um número com seu quádruplo Letra A

$x+\frac{x}{4} = 4x+\frac{x}{4}$

b) Letra A (10)

$\frac{x^{2} }{2}-2x=30\\\\\frac{x^{2} -4x}{2}=30\\\\x^{2} -4x=60\\x^{2} -4x-60=0$

$=4^{2}-4*1*(-60)\\=256\\\\x=\frac{-b +/\sqrt{delta} }{2*a} \\\\x=\frac{4+/-16}{2} \\\\x'= \frac{4+16}{2}= 10\\\\x''= \frac{4-16}{2} = -6$