Which function is a quadratic function? c(x) = 6x + 3x3 d(x) = x – 8x4 p(x) = –5x – x2 k(x) = 2x2 + 9x4

Step-by-step explanation:

We know that a function is quadratic if the degree of the function is 2.

And we also know that the degree of a polynomial is the highest exponent.

So, we see which of the given options has the highest exponent as 2

Third option has the highest exponent 2. Hence, the degree of this function should be 2 and thus, it is a quadratic function.

idk

step-by-step explanation:

use that smart brain

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11