Question

8×-65=-ײ ayuda.....

Answer 1

se cambian en los lados

-x^2=8x-65

se resta 65 en ambos lados

-x^2+65=8x-65+65

se simplifica

-x^2+65=8x

restar 8x de ambos lados

-x^2+65-8x=8x-8x

simplificar

-x^2-8x+65=0

usando la formula general para encontrar x 1,2 a=x^{2} b=-8x c=65

\frac{-\left(-8\right)+\sqrt{\left(-8\right)^2-4\left(-1\right)\cdot \:65}}{2\left(-1\right)}

=\frac{8+\sqrt{324}}{-2\cdot \:1}

x1=-13

\frac{-\left(-8\right)-\sqrt{\left(-8\right)^2-4\left(-1\right)\cdot \:65}}{2\left(-1\right)}

=\frac{8-\sqrt{324}}{-2}

=\frac{\sqrt{324}-8}{2}

x2=5