Question

Solve by completing the square

5v^2−21=10v

Answer 1

first rearrange the equation \[5v^2-10v-21=0\]
then use quadratic formula to solve it
\[x = -b \pm \sqrt{b^2-4ac}/2a\]

Answer 2

do you know how to used quadratic equation?

Answer 3

are you there?

Answer 4

the answer should be