Question

Please help with #12 im confused that is the key but i dont get it

Answer 1

Using subtraction of perfect squares, it is found that the result of the expression is of 184.

What is subtraction of perfect squares?

It is represented by the following identity:

$(a - b)(a + b) = a^2 - b^2$

In this problem, the expression is:

$(8\sqrt{3} - 2\sqrt{2})(8\sqrt{3} + 2\sqrt{2})$

Hence, applying the identity:

$(8\sqrt{3} - 2\sqrt{2})(8\sqrt{3} + 2\sqrt{2}) = (8\sqrt{3})^2 - (2\sqrt{2})^2 = 64(3) - 4(2) = 192 - 8 = 184$

Hence, the result of the expression is of 184.

To learn more about subtraction of perfect squares, you can take a look at  brainly.com/question/16948935

Answer 2

Given Equation

$\boxed{ \tt \: (8 \sqrt{3} - 2 \sqrt{2} )(8 \sqrt{3} + 2 \sqrt{2})}$

Step by step expansion:

$\dashrightarrow \sf \: (8 \sqrt{3} - 2 \sqrt{2} )(8 \sqrt{3} + 2 \sqrt{2})$

$\dashrightarrow \sf \: (8 \sqrt{3})^{2} - (2 \sqrt{2} {)}^{2}$

Reason:

(a + b)(a - b) = a²- b²

$\dashrightarrow \sf \: (8 {}^{2} \times { \sqrt{3} }^{2} )- (2 \sqrt{2} {)}^{2}$

$\dashrightarrow \sf \: (64 \times 3 ) - (2 \sqrt{2} {)}^{2}$

$\dashrightarrow \sf \: (64 \times 3 ) - (2 {}^{2} \times \sqrt{2} {}^{2} {)}$

$\dashrightarrow \sf \: 192- 8$

$\dashrightarrow \sf \: 184$

~BrainlyVIP ♡