how do i do B

[kind creek]

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[worldly eagle]

b is an example

is this just by having (x-4)(2x^3-13x....)

and doing long divison

[hollow seal]

Yes, show the remaining cubic has only 1 real root that isn't 4

Or if it has 3 real roots, they must be repeated

[worldly eagle]

thats all ik

idk how to do long divison

[hollow seal]

Same for integers

[vivid reef]

No. You have a cubic. You know one of its factors. So you divide that factor out and prove that the remaining quadratic has one factor.

[hollow seal]

Oh I misread lol

[worldly eagle]

so i take out x-4 out of f(x)

and then just factorise

[hollow seal]

Yes, you divide f by x-4

[worldly eagle]

the quadratic

[vivid reef]

You didn't misread, you read exactly what OP wrote. Which was wrong.

[worldly eagle]

ah i see

[hollow seal]

Fair lol

[worldly eagle]

alr ty

so it should give a queaditc

quadratic

[hollow seal]

Then either do the division, or reconstruct the quadratic

Yes 3-1=2

[worldly eagle]

what

wym

[hollow seal]

Cubic is degree 3

Linear is degree 1

So the quotient is degree 3-1

[worldly eagle]

oh in terms of powers?

[hollow seal]

In terms of degree of a polynomial

[worldly eagle]

oohhh

so we call it degree

so a quartic is a degree of 4

[hollow seal]

Yes..

As you should know from when you first learned about polynomials

[worldly eagle]

we havent learnt it

we learned subsituion