Q15. Subtract 3x(x-y) from the 3 sum of 4x(x-y) and 2y(x+y).
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lets first add the following terms.
4x(x-y) + 2y(x+y)
lets first open the brackets.
= 4x²-4xy + 2xy+2y²
= -4xy + 2xy + 4x² + 2y²
= -2xy + 4x² + 2y²
= 4x² + 2y² - 2xy
Now lets subtract the terms
4x² + 2y² - 2xy - 3x(x-y)
= 4x² + 2y² - 2xy - 3x² + 3xy
= 4x²-3x² + 2y² - 2xy + 3xy
= 2y² + x² +xy
Thank you.
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