Math, asked by vinitpatel108, 9 months ago

find a and b if 7+3 root5/2 +2root5 =a+b root 5​

Answers

Answered by raotd
1

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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