Question

Alguém pode me ajudar nessa pfv, tô precisando agora

Answer 1

Resposta:

x = 5 ou x = 2

Explicação passo a passo:

$x=\frac{-b+\sqrt{b^2-4\cdot \:\:a\cdot \:\:c}}{2\cdot \:a}\\\\Para\:\:\:a\:=\:1\:\:;\:\:b=-7\:\:;\:\:c=10\\\\x=\frac{-\left(-7\right)+\sqrt{\left(-7\right)^2-4\cdot \:\:\left(1\right)\cdot \:\left(10\right)\:}}{2\cdot \:\left(1\right)}\\\\x=\frac{7+\sqrt{49-40}}{2}\\\\x=\frac{7+\sqrt{9}}{2}\\\\x=\frac{7\pm 3}{2}\\\\x_1=\frac{7+3}{2}\:=\frac{10}{2}=5\\\\x_2=\frac{7-3}{2}\:=\frac{4}{2}=2$