Question

Alguém me ajuda??

3x²- 10x - 15​

Answer 1

Resposta:

$x1=\frac{10+2\sqrt{70} }{6}\\\\x2=\frac{10-2\sqrt{70} }{6}$

Explicação passo-a-passo:

3$x^{2}$-10x-15=0

$x=\frac{-b+-\sqrt{b^{2}-4.a.c } }{2.a} \\\\x=\frac{-(-10)+-\sqrt{(-10)^{2}-4.3.(-15) } }{2.3} \\\\x=\frac{10+-\sqrt{100+180} }{6}\\\\x=\frac{10+-\sqrt{280} }{6} \\\\x=\frac{10+-2\sqrt{2.5.7} }{6}\\\\x=\frac{10+-2\sqrt{70} }{6}\\\\x1=\frac{10+2\sqrt{70} }{6}\\\\x2=\frac{10-2\sqrt{70} }{6}$