How to factorise (a^4) - (7a^2 x b^2)- 18b^4?? Can show me step by step?? Btw, the answer is (a+3b)(a-3b)(a^2+2b^2)
Follow Math Help Forum on Facebook and Google+
Originally Posted by maybeline9216 How to factorise (a^4) - (7a^2 x b^2)- 18b^4?? Can show me step by step?? Btw, the answer is (a+3b)(a-3b)(a^2+2b^2) Let and . So we have . You should be able to factorise this by inspection... Now you have a Difference of Two Squares as the first factor. Factorising that gives .
View Tag Cloud