Question

Please help with the attatched!

Answer 1

Answer: a + b = 40

$(3+\sqrt{5})(7-6\sqrt{5})=3.7+7\sqrt{5}-3.6\sqrt{5}-6\sqrt{5}.\sqrt{5}\\\\=21+6.5-11\sqrt{5}\\\\=51-11\sqrt{5}$

because $(3+\sqrt{5})(7-6\sqrt{5})=a+b\sqrt{5}$

=> a = 51

    b = -11

=> a + b = 51 -11 =40

Step-by-step explanation:

Answer 2

Answer:

$a = -9 - 11\sqrt{5} - \sqrt{5}b$

a = 51

b= -11