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kanest
12.
Add like terms from both trinomials:

[tex]4x^{2} + -2x^{2} = 2x^{2}[/tex]
[tex]2x + -5x = -3x[/tex]
[tex]-1 + 3 = 2[/tex]

Combine these terms to get a new trinomial as your answer:

[tex]2x^{2} - 3x + 2[/tex]


13. 
Subtract like terms from both trinomials (note that subtracting a negative is the same as adding it as a positive):

[tex]3x^{2} - 5x^{2} = -2x^{2}[/tex]
[tex]-8x - -11x = -8x + 11x = 3x[/tex]
[tex]-1 - -1 = -1 + 1 = 0[/tex]

0 can be left out of the answer.

Combine these terms to get a binomial as your answer:

[tex]-2x^{2} + 3x[/tex]

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