Asked by Rylee

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

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?
Answered by Steve
well, just plug in -1 for each x:

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

(-1)^2 = (-1)(-1) = +1
Answered by PsyDAG
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 = ?
Answered by Rylee
--Steve-
--PsyDAG-okay, so 2(1) + (-9) + 1 = -6, right?
Answered by Steve
correct. Sorry about by typo.
Answered by Rylee
that's fine, I appreciate the help. Thank you guys!
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