Question 166368
{{{(10 + 7x)^2=(10+7x)(10+7x)=(10)(10)+(10)(7x)+(7x)(10)+(7x)(7x)=100+70x+70x+49x^2=100+140x+49x^2}}}



So in short, {{{(10 + 7x)^2=100+140x+49x^2}}}