find a and b if 7+3 root5/2 +2root5 =a+b root 5
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Answer:
a = 0 ; b = 1 ;
Explanation:
(7+3√5 / 3+√5 ) - (7-3√5 / 3-√5 ) = (7+3√5 )(3-√5) - (7-3√5 )(3+√5)
/ (3+√5)
= (21-7√5 +9√5 -15) - (21+7√5 -9√5 -15) / 3²-(√5)²
= 21-7√5 +9√5 -15 - 21-7√5 +9√5 +15) / 9-5
= 4√5 / 4
= √5
(7+3√5 / 3+√5 ) - (7-3√5 / 3-√5 ) = a + √5 *b
Therefore,
√5 = a + √5 *b
⇒ 0+ √5*1 = a + √5 *b
⇒ a = 0 ; b = 1 ;
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