2007-08-30 12:09:08 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
= (√5 - 2) (√5 + 3)
= 5 + 3 √5 - 2√5 - 6
= - 1 + √5
2007-09-03 11:09:52 · answer #1 · answered by Como 7 · 0⤊ 0⤋
sqrt(5) - 1
2007-08-30 12:15:45 · answer #2 · answered by danielomm314 2 · 0⤊ 0⤋
(Sqrt(5)-2)(Sqrt(5)+3)
= (Sqrt(5)-2)(Sqrt(5)+2) + (Sqrt(5)-2)
= 5-4 + Sqrt(5)-2
= -1 + Sqrt(5)
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You can also use foil method.
2007-08-30 12:12:19 · answer #3 · answered by sahsjing 7 · 0⤊ 0⤋
When multiplying the square root of a number times the square root of that same number, the answer is just that number.
(root5 - 2)(root5 + 3)
FOIL it.
5 + 3root5 - 2root5 - 6
You can subtract square roots as long as they have the same numbers under the radicals. Subtract the numbers in front and keep the number inside.
-1 + root5
Move this around because of the negative in front.
root5 - 1
2007-08-30 12:15:34 · answer #4 · answered by its_victoria08 6 · 0⤊ 0⤋
(Sqrt(5)-2)(Sqrt(5)+3)
* sqrt(5)*sqrt(5)=5
sqrt(5)*sqrt(5)+sqrt(5)*3- 2*sqrt(5)-6
5+3sqrt(5)-2sqrt(5)-6
-1+sqrt(5)
sqrt(5)-1
2007-08-30 12:12:03 · answer #5 · answered by cool j 2 · 1⤊ 0⤋