Question

Algebra need to solve question

Answer 1

Answer:

2

Step-by-step explanation:

$(3+\sqrt{7})(3-\sqrt{7})$

First do 3 x 3 = 9 - keep this 9 to the side for now

Then do 3 x $-\sqrt{7}$ = $-\sqrt{21}$ - also keep this to the side for now

Then do $\sqrt{7}$ x 3 = $\sqrt{21}$

Then do $-\sqrt{7}$ x $\sqrt{7}$ = -7

So,

9 $-\sqrt{21}$ + $\sqrt{21}$ - 7

Therefore, 9-7 = 2