book Maths Puzzle Numerical Ability

Can someone please show me how to do this:
(s+3)(s-3)

Read Solution (Total 0)

book Other Question

Name the properties used in each step.
1. =3C+5C+5(2)

2. =(3C+5C)+5(2)

3. =(3+5)C+5(2)

4. =8C+10 primefactorization...............the problem is...............52