Add x² + 2xy - y? to the result of subtract x² – 3y² from 2x2 - y2 +9.
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Step-by-step explanation:
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Step-by-step explanation:
2x²-y²+9 - x² - 3y² = x²+2y²+9
add x²+2y²+9 to x²+2xy-y
x²+2y²+9 + x²+2xy - y = 2x²+2y²+2xy - y +9
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