Question

7+3V5
28) Find values of values of a and b, if 7+3underroot 5/3 + underroot 5 —(minus) 7-3 underroot 5/3 - underroot 5 = a + underroot 5 b

Please reply fast!!....

Answer 1

Answer:

$- 11 - 303 \\ \\ \\ \\ \\ \\ \\ \\ \times \frac{?}{?}$

Step-by-step explanation:

$131 { { > 3 \times \div \div \div \sqrt[?]{?} \times \frac{?}{?} }^{2} }^{?} \times \frac{?}{?}$

Answer 2

Step-by-step explanation:

First take a^2= 28 - 10*3^(1/2)

=> 5^2 + (- 3^1/2) ^2+ 2 . 5.(-3^1/2) {{ of form x^2 + y^2 + 2.x.y = (x+y)^2}}

=> (5 - 3^(1/2)) ^2

That gives a = 5 - 3^1/2

Now let b^2 = 1/(7 + 4.3^1/2)

Multiply by 7 - 4.3^1/2 on both numerator and denominator

gives, b^2 = 7 - 4.3^1/2

=> (2)^2 + (-3^1/2)^2 + 2.(2).(-3^1/2)

{{ of form x^2 + y^2 + 2.x.y = (x+y)^2}}So this gives

b = 2 - 3^1/2

You asked the value of a- b = 5 - 2 = 3

Thx