Question

rationalise the denominator 2 upon under root 7 minus under root 5​

Answer 1

Answer:

Step-by-step explanation:

2/√7-√5 = 2/√7-√5 * √7+√5/√7+√5

(2)(√7+√5)/(√7-√5)(√7+√5)

2√7+2√5/7-5

2√7+2√5/2

Taking 2 as common:-

2(√7+√5)/2

√7+√5

Hence, the answer is √7+√5

Answer 2

Answer:

→ √7 + √5

Step-by-step explanation:

★ Refer to the attachment for the solution.

Know more:

• When the denominator of an expression contains the term with the square root, the process of converting it to an equivalent expression whose denominator is a rational number is called rationalising the denominator.

How to rationalize the denominator?

• As we know that we have to write the question given in an equivalent expression in which the denominator is a rational number.
• To rationalize the denominator, we have to change the signs (+ or -) of the term in the denominator and further have to multiply it by writing it in a fractional form.

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