Question

Which of the following constants can be added tox^2-10x to form a perfect trinomial

Answer 1

`Use\ (a-b)^2=a^2-2ab+b^2\\\\x^2-10x=x^2-2(x)(5)\\\\\text{therefore we need add}\ 5^2\\\\x^2-2(x)(5)+5^2=(x-5)^2`