Question

x^4-10x^2+21 divided by x^2-3
=x^2+7?

Answer 1

oops should be x^2-7

Answer 2

again, use y=x^2

Answer 3

you are right tena

Answer 4

x^4 - 10x^2 + 21 = (x^2-7)(x^2-3). So, the answer is right.