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3 years ago

Marcus finds that (3x^2-2y^2+5x)+(4x^2+12y^2-7x)=7x^2-10y-2x. What error did Marcus make?

Mathematics

2 answers:

ale4655 [162]3 years ago

7 0

Answer:

He combined the terms –2y2 and 12y2 incorrectly.

boyakko [2]3 years ago

4 0

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.

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2 years ago

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andrey2020 [161]

Answer:

x = 4 , y = 1

Step-by-step explanation:

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x + y = 5 → (2)

Multiplying (2) by - 2 and adding to (1) will eliminate the y- term

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