Question 256600
I assume you want to factor the following:
(i) {{{6x^4-39x^2+60}}}
Replace x^2 with a dummy variable like U. So U = x^2 and U^2 = x^4. We get
(ii) {{{6U^2-39U+60}}}
Now this looks more familiar. Factor this to get
(iii) {{{(U-4)(6U-15)}}}
Remember to put back x^2 where you had U. We get
(iv) {{{(x^2-4)(6x^2-15)}}}
we can factor even further to get
(v) {{{(x+2)(x-2)(3)(2x^2-5)}}}