Question

what number must be added to complete the square x^2+7x

Answer 1

hi :)
\(\Huge \mathcal{\text{Welcome To OpenStudy}\ddot\smile} \)

since we know
\(\large (a+b)^2 = a^2+2ab+b^2\)

we have 2b as 7 here
and we need b^2

Answer 2

so from 2b = 7
first find b
and then square it, thats it!

Answer 3

b=7/2
b=(7/2)^2