Question

Help me please!! what is the solution set on x^2-10=30x?

Answer 1

X² - 30x - 10 =0

We are going to use formula
$x= \frac{-b+/- \sqrt{b^{2}-4ac} }{2a} \\ \\ a= 1, b=-30, c= - 10 \\ \\x= \frac{30+/- \sqrt{(-30)^{2}-4(1)(-10)} }{2} \\ \\ \frac{30+/- \sqrt{900+40} }{2}= \frac{30+/- \sqrt{940} }{2}= \frac{30+/- \sqrt{235*4} }{2} = 15+/- \sqrt{235} Answer\ is\ C.$