Question

The number (3-√7) (3+√7) is

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Answer 1

Answer:

(3-√7) (3+√7) = 3

Step-by-step explanation:

By using the formula (a-b) (a+b) = a^2 + b^2

(3-√7) (3+√7) = (3^2) - (√7^2)

(3-√7) (3+√7) = 9 - 7

(3-√7) (3+√7) = 3

Here you go...

Answer 2

Answer:

step step by step explanation:

• Multiply the equation:

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

$\Rightarrow{\blue{9+3\sqrt{7} -3\sqrt{7} -7}}$

$\Rightarrow{\blue{9-7}}$

$\Rightarrow{\fbox{\blue{2}}}$ Ans