1.

What is the value of (√11-√7)×(√11+√7) *a) -4b) 4c) √11d) √7​

Answer»

( \sqrt{11}  -  \sqrt{7} )( \sqrt{11}  +  \sqrt{7} ) \\  = ( ({ \sqrt{11}) }^{2}  -  {( \sqrt{7}) }^{2}  \\  = 11 - 7 \\  = 4



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