Question

( 3 - root 5 + 2 root 7 ) ( 3 root 5 - 2 root 7 )​

Answer 1

Answer:

$(3\sqrt{5} + 2 \sqrt{7} )(3 \sqrt{5} - 2 \sqrt{7} ) \\ = ( {3 \sqrt{5} })^{2} - ( {2 \sqrt{5} })^{2} \\ = (9 \times 5) - (4 \times 5) \\ = 45 - 20 \\ = 25$

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Answer 2

Step-by-step explanation:

(3√5+2√7)(3√5-2√7)

(3√5)²-(2√7)²

9×5-4×7

45-28

17

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