Question

how do you simplify x^4 - 98?

Answer 1

Are you sure it isn't 2x^4-98?

Answer 2

It's x to the power of 4 - 98.

Answer 3

It's already in simple form.

Answer 4

The answer is (x^2-7)(x^2+7) but I don't know why

Answer 5

You don't know what that is the answer because you have posted the problem incorrectly.

Answer 6

\[(x^2-7)(x^2+7)=x^4-49\]

Answer 7

So that COULD NOT be the answer to the problem you posted.

Answer 8

The full question is f(x) = 2x^5 - x^4 - 98x + 49. Find one rational zero. Use the zero found and division to write the polynomial in completely factored form.

Answer 9

What zero did you find?

Answer 10

The positive x intercept of .5

Answer 11

So that means that 2x-1 is a factor. Did you divide by 2x-1 to see what the remaining polynomial is?

Answer 12

Yes and that's how I got x^4 - 98.