simplify :
a) (12+√5) (7+ √3)
b) (√13+√7)² (√13-√7)²
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Answer:
answer is 6
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a) (12+√5) (7+√3)
84+7√5+12√3+√15
b) (√13+√7)^2 (√13-√7)^2
[13+2√91+7] [13-2√91+7]
169+26√91+91-26√91-364-14√91+91+14√91+49
69+91-364+91+49
160-364+140
160+140-364
300-364
-64
hence, the answer is -64
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