exam Maths Puzzle Numerical Ability

Hello out there,I need some help with some problems,the first one is,Evaluate:(a+b)^2.The next one is,Multiply:(a-2b)(a+2b).The next one is,Multiply:(g-6h)(g-6h).And the last one is,Multiply:x(x+1)(x-1).Thanks to whoever can help.

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exam Other Question
To hire a chain saw costs a fixed charge plus a daily amount. To hire the chain saw for 6 days costs £22.50 and to hire itfor 10 days costs£32.50. How much would it cost to hire th Simplify by combining like terms.

x√18 - 3√8x^2