Math, asked by ananyamittal31507, 3 months ago

rationalise the denominator of 4÷(7√5-5√7)

Answers

Answered by Sayona17

2

Answer:

(21*4√5+20*4√7)÷70

Step-by-step explanation:

=>4÷(7√5-5√7)

=>[4÷(7√5-5√7)]*[(7√5+5√7)÷(7√5-5√7)]

=>(21*4√5+20*4√7)÷(7²√5²-5²√7²)

=>(21*4√5+20*4√7)÷(49*5-25*7)

=>(21*4√5+20*4√7)÷(245-175)

=>(21*4√5+20*4√7)÷70

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