Expand the brackets and simplify the surds:
(8 + √5) (8 - √5)
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Expand the brackets and simplify the surds:
(8 + √5) (8 - √5)
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( 8 + √5 ) ( 8 - √5 )
( a + b ) ( a - b ) = a² - b²
=> ( 8 )² - ( √5 )²
=> ( 8 × 8 ) - ( √5 × √5 )
=> 64 - 5
=>
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