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Question
Add x2 − a2, −5x2 + 2a2, −4x2 + 4a2
Solution
Required sum = x2 − a2 + (−5x2 + 2a2) +( −4x2 + 4a2 )
Rearranging and collecting the like terms = x2 -5x2 -4x2 -a2 + 2a2 +4a2
= (1-5-4)x2 +(-1+2+4)a2
= -8x2 + 5a2
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