Question

Factorise : x^3- 7x^2 +1+5x^2 ​

Answer 1

Step-by-step explanation:

put x=1 we get 1-7+1+5=0

x-1)x^3-2x^2+1(x^2-x-1

x^3-x^2

_____________

-x^2+0x

-x^2+x

_______________

-x+1

-x+1

_________________

0

(x-1) (x^2-x-1)=0

x=1+ or -√(1^2+(-1^2))/2

x=1+or-√2/2

x=1+√2/2,1-√2/2,1