exam Maths Puzzle Numerical Ability

Can someone show me how to do this problem?

Factor completely 9x^2-4

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exam Other Question

THis is a factoring word problem using the principle of zero. The question says "Find two consecutive, negative integers whose product is 156." Could you please help me? simplify each expression
1. 15(x^4y^3)^4 divided by 21(x^5y)^2
2. 8^0
3. 12 divided by (2x)^0
4. 1 divided by 5^-3