exam Maths Puzzle Numerical Ability

(x+2)squared-4(x+2)-21
factor completely

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exam Other Question

I need help factoring a polynomial please...I can do it with numbers, but the letters through me off.
a+a^2b^2+a^3b^3

Thanks for your help.
If the sales tax rate is 6.5% AND $2500 is collected in sales tax, how much were the sales?