Question

Factorise f(x)=x^2-x-4

Answer 1

x^2-x-4

here we have to multiply x^2 coefficient and constant number . you have to get the middle term when we add or subtract the product . but it not factorise

Answer 2

Answer:

Step-by-step explanation:x^2-x-4

x^2-x+1/4-17/4

(x+1/2)^2-(√17/2)^2

Using (a^2-b^2)=(a+b)(a-b)

So (x+1/2)^2-(√17/2)^2= (x+1/2+√17/2)(x+1/2-√17/2)