Question

What are the solutions of 5x2 = -15x?

Answer 1

\[\LARGE 5x^2=-15x\]
\[\LARGE 5x^2+15x=0\]
.. note that here you have , the quadratic formula:
use its formula:
\[\LARGE x_{1/2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\]
you have:
\[\LARGE 5x^2+15x+0=0\]
now substitute
a=5
b=15
c=0

and there you go :)

Answer 2

thanks