Question

-3ײ+18×-15=0 dnv ....​

Answer 1

Resposta:

-3ײ+18×-15=0. (÷ -3).

x² - 6x + 5 = 0.

(x-1). (x-5) = 0

x'=1 , x"=5.

Explicação passo a passo:

Answer 2

$-3x^2+18x-15=0$

$a=-3\quad b=18\quad c=-15$

$\Delta=b^2-4\cdot a\cdot c$

$\Delta=18^2-4\cdot(-3)\cdot(-15)$

$\Delta=324-180$

$\Delta=144$

$x=\dfrac{-b\pm\sqrt\Delta}{2\cdot a}$

$x=\dfrac{-18\pm\sqrt{144}}{2\cdot(-3)}$

$x=\dfrac{-18\pm12}{ -6}\begin{cases}x'=\dfrac{-18+12}{-6}=\dfrac{-6}{-6}=1\\\\x''=\dfrac{-18-12}{-6}=\dfrac{-30}{-6}=5\end{cases}$

$\red{\boldsymbol{ S=\{1~;~5\}}}$