(square root 4- square root 7)( square root 4+square root 7)
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Answer:
(√4-√7)(√4+√7)
=(√4×√4)+(√4×√7)-(√7×√4)-(√7×√7)
=4+√(28)-√(28)-7
=4-7
=-3
(or)
By formula
(a-b)(a+b)=a²-b²
(√4-√7)(√4+√7) =(√4)²-(√7)²
=4-7
=-3
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