(4 +square root 5) * ( 3 + square root 5) 12 +5 = 17
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(3- square root 5) *( 3 + square root 5) 9 +5 = 14
Did I get it right ??//
2007-01-13 12:37:47 · 4 answers · asked by TheMiddleisSafe 3 in Science & Mathematics ➔ Mathematics
No.
(4 +square root 5) * ( 3 + square root 5) is not 4x3+5 which is 17.
It is 12 +7.5^1/2+5 which is 17+7.5^1/2.
2007-01-13 12:42:26 · answer #1 · answered by A 150 Days Of Flood 4 · 1⤊ 0⤋
a) (4 + \/5)(3 + \/5) =
4x3 + (\/5)² + 4\/5 + 3\/5 =
12 + 5 + 7\/5 =
17 + 7\/5
<>
b) (3 - \/5)(3 + \/5) =
Solving:
3x3 -3\/5+ 3\/5 - (\/5)² =
3² - (\/5)² = 9 - 5 =
4
<>
2007-01-13 13:29:31 · answer #2 · answered by aeiou 7 · 0⤊ 0⤋
I'm afraid not! Back to the drawing board. Maybe you should read the manual on how to use your calculator - that might help.
2007-01-13 13:04:15 · answer #3 · answered by Dr Dave P 7 · 0⤊ 0⤋
No.
The answer above hits it right on the head.
2007-01-13 12:47:25 · answer #4 · answered by JasonM 7 · 1⤊ 1⤋