Question

Find the roots of x^3 – x^2 + 2 = 0
x = 1 + 2i, x = 1 – 2i, x = 1

x = –1 + i, x = –1 – i, x = –1

x = –1 + 2i, x = –1, x = – 2i, x = 1

x = 1 + i, x = 1 – i, x = –1
@jabez177

Answer 1

i know it is -1

Answer 2

@mathmale

Answer 3

@zepdrix

Answer 4

@TheSmartOne

Answer 5

would -1 be right?

Answer 6

If you try x = -1 in the polynomial, it evaluates to zero.
That means x = -1 is a root, and x + 1 is a factor.
Now divide the polynomial by synthetic or long division by x + 1.
Then you get a quadratic.
Use the quadratic formula to find the other 2 roots.

Answer 7

Can you help with that cause i am terrible at dividing @mathstudent55

Answer 8

You understand so far why x + 1 is a factor?

Answer 9

yes because -1 is a root