Question 713565
First one:

{{{(a+2)(2a)+7a+14 =(a+2)(2a)+(a+2)(7)=(a+2)(2a+7) }}}


second:

{{{64x^2+80xy+25y^2=(8x)^2+2(8x)(5y)+(5y)^2=(8x+5y)^2
}}}


:)