Algebra 1b HELP

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?

asked by Rylee
  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

    posted by Steve
  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 = ?

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

    posted by Rylee
  4. correct. Sorry about by typo.

    posted by Steve
  5. that's fine, I appreciate the help. Thank you guys!

    posted by Rylee

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