Which of the following polynomials is in standard form?

x+x2

c2-6c

y2+y4

2z3+z5-9

Precalculus question, image attached.

Which zero pair could be added to the function f(x) = x2 + 12x + 6 so that the function can be written in vertex form? o 3, -3o 6,629,-936, 36

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.