Question

(3+√7)(3-√7) =a-b√7
find the value of a and b

pls tell with calculations​

Answer 1

Answer:   a=9    b =√7    

(3+√7)(3-√7) =a-b√7                               (a+b) (a-b) = a^2-b^2

(3+√7)(3-√7) = $3^{2}$ - 7

(3+√7)(3-√7) = 9 - 7

a = 9

b√7   = 7

b = 7 / √7

b = √7      

Step-by-step explanation:

Answer 2

Answer:

$(\sqrt{3} + \sqrt{7} )( \sqrt{3} - \sqrt{7} ) = ( \sqrt{3} )^{2} - ( \sqrt{7} ) ^{2} \\ \\ \\ = 3 - 7 \\ \\ = - 4$