Question

Complete the square

Vsquared + 10v -21 = 0

Answer 1

take half the middle coefficent........

Answer 2

so 5v

Answer 3

just 5

Answer 4

square it

Answer 5

then add and subtract that value from the left side of the equation, should look something like this:
v^2+10v+25-25-21=0
(v+5)^2-46=0

Answer 6

thank you