4. (a) What should be added to x2 + xy + y2 to obtain 2x2 + 3xy?
(b) What should be subtracted from 2a +86 + 10 to get – 3a + 7b+16?
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Answer:
a) x² +2xy -y² should be added
b) -5a +7b -70 should be subtracted
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