Stationary points of y2 + 4xy +3x2 + x2
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Answer:
2x² - 5xy - 2y²
Subtract x² + xy + y² from 3x² - 4xy - y² to obtain the expression to be added
3x² - 4xy - y² - (x² + xy + y² ) ← distribute by - 1
=3x² - 4xy - y² - x² - xy - y² ← collect like terms
= 2x² - 5xy - 2y²
Thus
adding 2x² - 5xy - 2y² to x² + xy + y² gives 3x² - 4xy - y²
Step-by-step explanation:
Hope this helps:) ジョセフ
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