Answer:
7x^2+10y^2-2x is the correct answer, Marcus put -10y INSTEAD of +10y^2
Step-by-step explanation:
(3x^2-2y^2+5x)+(4x^2+12y^2-7x)
Combine like terms- I'll add x^2 first, then y^2, and then finally x, and it will be in that order.
7x^2+10y^2-2x
Make sure to check your signs are correct, and you wrote down the proper exponents.
