Question

(5-5sq.root) (5+5sq.root)

Answer 1

Answer:

(a+b)(a-b)=a sqr. - b sqr.

Step-by-step explanation:

25-5=20

Answer 2

Answer:

20

Step-by-step explanation:

$(5 - \sqrt{5} )(5 + \sqrt{5} ) \\ (a + b )(a - b) = {a}^{2} - {b}^{2} \\ ( {5})^{2} - ({ \sqrt{5} })^{2} \\ = 25 - 5 \\ = 20$

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