Question

3×(2×-5)=9-2×

me ajudem pls​

Answer 1

Resposta:

S: { $\frac{13+\sqrt{385}}{2\times6},\frac{13-\sqrt{385}}{2\times6}$ )

Explicação passo a passo:

$3x(2x-5)=9-2x\\6x^2-15x=9-2x\\6x^2-13x-9=0$

$\Delta=b^2-4ac$

$\Delta=(-13)^2-4\times6\times-9\\\Delta=169+216\\\Delta=385$

$x=\frac{-b+-\sqrt{\Delta}}{2a}$

$x'=\frac{13+\sqrt{385}}{2\times6}\\x'=\frac{13+\sqrt{385}}{12}$

$x''=\frac{13-\sqrt{385}}{2\times6}\\x''=\frac{13-\sqrt{385}}{12}$