Question 82210
1. find the product {{{(7x+1)(x^2+1)=7x^3+x^2+7x+1}}}
2. find the product: {{{(2x+6)(x-10)=2x^2+6x-20x-60=2x^2-14x-60}}}
3.evalute: {{{(a+b)^2=(a+b)(a+b)=a^2+ab+ab+b^2=a^2+2ab+b^2}}}
4.evalute:  {{{(a-2b)(a+2b)=a^2+2ab-2ab-4b^2=a^2-4b^2}}}