Answer with explanation:
We have to factorize the expression:
[tex]\rightarrow 1-2.25 x^8\\\\=(1)^2 - (1.5x^4)^2\\\\=(1-1.5 x^4)(1+1.5 x^4)\\\\=[1-(\sqrt{1.5}x^2)^2][1+(\sqrt{1.5}x^2)^2](1+1.5 x^4)\\\\=[1-x\times(1.5)^{\frac{1}{4}}][1+x\times(1.5)^{\frac{1}{4}}][1+(\sqrt{1.5}x^2)^2][1+1.5 x^4][/tex]
Used the Identity to solve the problem
[tex]a^2-b^2=(a-b)(a+b)[/tex]