Question

x squared - 10x +? complete the square

Answer 1

When you are faced with the problem
\[x^2+cx+?,\]finding the term that "completes the square" follows:\[x^2+cx+\frac{c^2}{4}=\left(x+\frac{c}{2}\right)^2.\]

Answer 2

so is it 25

Answer 3

That's correct. Always try it out and see for yourself:\[x^2-10x+25=(x-5)^2.\]