quadratic equation: solve using the square root property: 5x^2 - 1 = 74?

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2006-12-27 00:06:38 · 3 answers · asked by styles4u 4 in Science & Mathematics ➔ Mathematics

5x^2 - 1 = 74
5x^2 = 74+1
5x^2 =75
x^2=75/5

x^2 =15
x=+ or - sqrt(15)

2006-12-27 00:10:44 · answer #1 · answered by iyiogrenci 6 · 0⤊ 0⤋

5xÂ² -1 = 74
5xÂ² = 75
xÂ² = 15
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x = Â± â15

2006-12-27 08:23:19 · answer #2 · answered by Jicotillo 6 · 0⤊ 0⤋

5x^2 - 1 =74
5x^2 = 75
x^2 = 15
x=+/-sqrt(15)
x=+/-3.872983...

2006-12-27 08:58:36 · answer #3 · answered by Anonymous · 0⤊ 0⤋