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=> 13-a√10=(√8+√5)²= 8+5+2√40= 13+4√10
=> 13-a√10= 13+4√10
=> -a√10= 4√10
=> -a=4
So,
=> a = -4
So on comparing,
=> a = - 4.
- I Hope it's Helpful My Friend.
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