Question

помогите пжпжпжпжжжпжпжпжпжпжжпд​

Answer 1

$\displaystyle a^2-9= (a-3)(a+3)\\\\b^2+10b+25=b^2+2*5*b+5^2=(b+5)^2=(b+5)(b+5)\\\\25x^2-16=(5x)^2-4^2=(5x-4)(5x+4)\\\\9x^2-12xy+4y^2=(3x)^2-2*3*2xy+(2y)^2=(3x-2y)^2=(3x-2y)(3x-2y)$