Question

2/3√7 into rationalise denominator​

Answer 1

Answer: We have to rationalize the denominator of 2/3 - √7

Solution :

Dor rationalising the denominator we have Multiply the numerator and denominator by the Denominator but we should change the sign.

(-) changes into (+)

(+) changes into (-)

›› 2/3- √7 × (3 +√7)/(3 +√7)

›› 2(3 + √7)/(3 - √7)(3 +√7)

By using identity

(a + b)(a - b) = a² - b²

›› 2(3 + √7)/(3² - √7²)

›› 2(3 + √7)/(9 - 7)

›› 2(3 + √7)/2

›› 3 + √7

Step-by-step explanation:

Answer 2

Answer:

Hence,

Rationalised.

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