Question

Calculati:
$(2- \frac{ \sqrt{3} }{4} )(2+ \frac{ \sqrt{3} }{4} )$

Answer 1

$a^{2}- b^{2}=(a-b)(a+b) => ( 2- \frac{ \sqrt{3} }{4} )( 2+ \frac{ \sqrt{3} }{4} )= 2^{2} - ( \frac{\sqrt3}{4} )^{2} =4-3/16$  
=(16-3)/16=13/16

Answer 2

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