Answer
a. 15
Work Step by Step
Substitute 3, -6, and -9 for x, y, and z and solve the expression.
2$x^{2}$ - y + z = 2$(3^{2})$ - (-6) + (-9) = 2(9) - (-6) + (-9) = 18 - (-6) + (-9) = 24 + (-9) = 15
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