The sum of -8x² + 6y² + 5 and 2x² - 3y² is:
a) 6x² + 3y² + 5
b) -3x²- 4y²-5
c) -6x² + 3y² +5
d) None
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The sum of -8x² + 6y² + 5 and 2x² - 3y² is:
a) 6x² + 3y² + 5
b) -3x²- 4y²-5
c) -6x² + 3y² +5
d) None
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Answer:
c) -6x² + 3y² +5
= -8x² + 6y² + 5 + 2x² - 3y²
=( -8x² +2x² )+ (6y² - 3y² ) + 5
= -6x² + 3y² +5
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