Question

Разложите на множители.
a^2+5a+5b-b^2

Answer 1

$\displaystyle\bf\\a^{2} +5a+5b-b^{2} =(a^{2} - b^{2})+(5a+5b)=\\\\\\=(a+b)\cdot(a-b)+5\cdot(a+b)=(a+b)\cdot(a-b+5)$