Simplify 2x^2 - y for x = 3 and y = -2. *20 *14 *16 *10 Please help, also can you explain it if you can?

asked Mar 9, 2016 51.7k views

5 votes

Simplify 2x^2 - y for x = 3 and y = -2.

*20
*14
*16
*10
Please help, also can you explain it if you can?

7.4k points

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5 votes

$x=3 \\ y=-2 \\ \\ \hbox{plug the values into the expression:} \\ 2x^2-y=2 * 3^2-(-2)=2 * 9 +2=18+2=\boxed{20}$

Tylor answered Mar 12, 2016

by Tylor

7.5k points

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