Consider the equation y=2x2+9x+1.

Question

When x=−1, what is the value of y?

This question is a 'enter correct answer'. It doesn't give me any options. But, I did the math three times already, shouldn't

Y=-10?

Answer 1

well, just plug in -1 for each x:

y = 2(-1)^2 + 9(-1) + 1
= 2-9+1
= -7

(-1)^2 = (-1)(-1) = +1

Answer 2

Online "^" is used to indicate an exponent, e.g., x^2 = x squared.

A negative times a negative = a positive.

y = 2x^2 + 9x + 1 = 2(1) + (-9) + 1 = ?

Answer 3

--Steve-
--PsyDAG-okay, so 2(1) + (-9) + 1 = -6, right?

Answer 4

correct. Sorry about by typo.

Answer 5

that's fine, I appreciate the help. Thank you guys!