1. Subtract:
a. 2x2 - 5xy + 3y2 + 5 from 4x2 + 3xy - 5y2 + 9.
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Answer:
= 4×2 + 3xy - 5y2 + 9 - ( 2×2 - 5xy +3y2 + 5 )
= 4×2 + 3xy - 5y2 + 9 - 2 × -2 + 5xy - 3y2 - 5
= 8 + 3xy - 5y2 + 9 + 4 + 5xy - 3y2 - 5
= 3xy + 5xy -5y2 -3y2 + 8 + 9 + 4 - 5
= 8xy - 8y2 + 15
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