(a+b)^2 - 100
-> (a+b)(a+b)-100
-> a^2+2ab+b-100
-> a(a+2b)(b^2-100)
-> a(a+2b)(b -10)(b+10)
The answer in the book (a+b-10)(a+b+10)
And I have not a clue on how they got this ? any help would be appreciated
(a+b)^2 - 100
-> (a+b)(a+b)-100
-> a^2+2ab+b-100
-> a(a+2b)(b^2-100)
-> a(a+2b)(b -10)(b+10)
The answer in the book (a+b-10)(a+b+10)
And I have not a clue on how they got this ? any help would be appreciated