Question

Please solve these factories questions.​

Answer 1

vi) Let x+y be a

4a^2-12a+9

=4a^2-4a-9a+9

=4(a-1)-9(a-1)

=(4-9)(a-1)

a=x+y

(4-9)(x+y-1)

=-5(x+y-1)

viii)Let x+1=a

y+2=b

81a^2+90ab+25b^2

=(9a)^2+(2×9a×5b)+(5b)^2

=(9a+5b)^2

=(9x+9+5y+5)^2

=(9x+5y+14)^2

=(9x+5y+14)(9x+5y+14)