Question

What substitution should be used to rewrite x10−13x5+12=0 as a quadratic equation?

u=x10

u=x2

u=x5

u=x20

Answer 1

C

Explanation:

put x^5=u

Answer 2

`u=x^(5)`

Explanation:

`x^(10) - 13x^(5) + 12 = 0\\\\(x^(5))^(2) - 13x^(5) + 12 = 0\\\\u^(2)-13u+12=0`