Question

1\25a^2-1\49(a-b)^2 81m^2-36m+4 x^4-y^2 4(5a-b)^2-9(2a+3b)^2

Answer 1

1/(25a^2)-1/[49(a-b)^2 ]=[1/(5a)+1/(7b)][1/(5a)-1/(7b)]=(7b+5a)(7b-5a)/(35ab)81m^2-36m+4=(9m)²-2*9*2m+2²=(9m-2)²x^4-y^2=(x²+y)(x²-y)4(5a-b)^2-9(2a+3b)^2=[2(5a-b)+3(2a+3b)][2(5...