Question

13x²- 12y²+ 6x²- 8y²​

Answer 1

Answer:

205x^2 + 208^2

Step-by-step explanation:

you have to first add the numbers with x^2 and then add the numbers with y^2.

Answer 2

Answer:

19x2 -20y2

Step-by-step explanation:

$(13x^2 - 12y {}^{2} ) + (6x^2 - 8y {}^{2}) \\ 13x { }^{2} + 6x {}^{2} + - 12y^{2} - 8y {}^{2} \\ 19x {}^{2} + 20y {}^{2}$

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