Question

How do you simplify (3–2√7)(3+2√7)?

Answer 1

(3+2√7)(3-2√7)

=> (3)² - (2√7)²

=> 9 - 28

=> -19

Answer 2

$\huge{\underline{\mathbb{\red{Answer}}}}$

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

$= > {3}^{2} - (2 \sqrt{7} ) {}^{2}$

$= > 9 - 28$

$= > - 19$

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