Question

(7root3 + 3root7) - (3root3 - 2root7) = a root3 - b root7 then find a and b

Answer 1

this may help you my friend.

Answer 2

$(7 \sqrt{3} + 3 \sqrt{7} ) - (3 \sqrt{3} - 2 \sqrt{7}) = a \sqrt{3} - b \sqrt{7} \\ = > 7 \sqrt{3} + 3 \sqrt{7} - 3 \sqrt{3} + 2 \sqrt{7} = a \sqrt{3} - b \sqrt{7} \\ = > 4 \sqrt{3} + 5 \sqrt{7} = a \sqrt{3} - b \sqrt{7} \\ = > a = 4 \\ = > b = -5$