Question

rationalise√7-√5/√7+√5​

Answer 1

Answer:

6-1√2

Step-by-step explanation:

√7-√5/√7+√5×√7-√5/√7-√5

$(x - y) { }^{2} = x {}^{2} - 2xy + y { }^{2}$

√7-√5×√7-√5=(√7-√5)^2

(√7)^2-2(√7-√5)+(√5)^2

7-2√2+5

7+5-2√2

12-2√2

$(x + y)(x - y) = {x }^{2} - {y}^{2}$

(√7+√5)(√7-√5)=(√7)^2-(√5)^2

7-5=2

12-2√2/2

12/2-2√2/2

6-1√2

Answer 2

Answer:

6-2√35

Step-by-step explanation:

√7-√5/√7+√5×√7-√5/√7-√5