Evaluate
2\left(z-x^{2}\right)
Factor
2\left(z-x^{2}\right)
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z+z+3x^{2}-5x^{2}
Combine -2x^{3} and 2x^{3} to get 0.
2z+3x^{2}-5x^{2}
Combine z and z to get 2z.
2z-2x^{2}
Combine 3x^{2} and -5x^{2} to get -2x^{2}.
-2x^{2}+2z
Multiply and combine like terms.
2\left(-x^{2}+z\right)
Factor out 2.
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