Question

Factorise 9x^4 +26x² -3​

Answer 1

Answer:

Hey,

Assume x^2 to be any variable say t

Then, 9t^2+26t-3=0

Lets factorise it, using middle term split

9t^2+27t-t-3=0

9t(t+3) -1(t+3)=0

(t+3)(9t-1)=0

t=-3, t= 1/9

Now we assumed t to be x^2 so back up

x²=-3 (which is not possible)

x²=1/9=+-1/3