Question

Find out the following squares by using the identities:
$(a-5{)}^2$

Answer 1

We know identity $(x+y{)}^2=x^2+2xy+y^2$

By using this identity we can solve further as

$(a-5{)}^2=a^2+5^2-2\times 5\times a=a^2+25-10a$

This is the required answer.