Question

find the value of a&b if 5-4root2 by 5+4root2 =a+broot2​

Answer 1

Answer:

Is this okk??? comment yarr please okk I have corrected this....

Step-by-step explanation:

5-4_/2/5+4_/2=a+b_/2

5-(4/5)_/2+4_/2=a+b_/2

5-(4_/2-20_/2)/5=a+b_/2

5+(16/5)_/2=a+b_/2

So Compairing both sides..

a=5

b=16/5

Answer 2

Answer:

(5-4√2÷5+4√2)×(5-4√2÷5-4√2) =

-7(57+4√2) ÷(57+4√2)(57-4√2) =

-57/7 + 40/7√2

so,

a=-57/7 and 40/7