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Question

(a) From the sum of 3xy + 11 and − y − 11, subtract 3xy − 11.

(b) From the sum of 4 + 3x and 5 − 4x + 2x2, subtract the sum of 3x2 − 5x and
− x2 + 2x + 5.

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Solution

(a) (3xy + 11) + (− y − 11)

= 3xy + 11 − y − 11

= 3xy y + 11 − 11

= 3x − 2y

(3x − 2y) − (3xy − 11)

= 3x − 2y − 3x + y + 11

= 3x − 3x − 2y + y + 11

= − y + 11

(b) (4 + 3x) + (5 − 4x + 2x2) = 4 + 3x + 5 − 4x + 2x2

= 3x − 4x + 2x2 + 4 + 5

= − x + 2x2 + 9

(3x2 − 5x) + (− x2 + 2x + 5) = 3x2 − 5xx2 + 2x + 5

= 3x2x2 − 5x + 2x + 5

= 2x2 − 3x + 5

(− x + 2x2 + 9) − (2x2 − 3x + 5)

= − x + 2x2 + 9 − 2x2 + 3x − 5

= − x + 3x + 2x2 − 2x2 + 9 − 5

= 2x + 4


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