Question

a) x^2 + y^2 -25 +2xy

b) a ^2- 2a -4b^2-4b

c)a^2-b^2-5a-5b

phan tich da thuc thanh nhan tu

Answer 1

\(a,=\left(x+y\right)^2-5^2=\left(x+y+5\right)\left(x+y-5\right)\)

\(b,=\left(a-1\right)^2-1-\left(2b+1\right)^2-1=\)

\(c,=\left(a-b\right)\left(a+b\right)-5\left(a+b\right)=\left(a+b\right)\left(a-b-5\right)\)

Answer 2

a,( x² + 2xy + y² ) -25

=( x + y )² - 5²

=( x + y + 5) ( x + y - 5)

b,