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Simplify (√5+4)(√5-2) A)-3+2√5 B)3+2√5 C)-2+3√5

Simplify (√5+4)(√5-2) A)-3+2√5 B)3+2√5 C)-2+3√5
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1 vote
Simplify (√5+4)(√5-2) A)-3+2√5 B)3+2√5 C)-2+3√5

User Susannah Potts
by
8.1k points

1 Answer

5 votes

Answer:

A

Explanation:


(x + y)(a - b) = xa - xb + ya - yb

(√5+4)(√5-2) =

=
( {√(5))}^(2) - 2 √(5) + 4 √(5) - 8

=
5+ 2 √(5) - 8

=
- 3+ 2 √(5)

Hope this helps ^-^

User Bgoodr
by
8.2k points
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