re: OT Math Buffs-Solve for X

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My study guide says the sqrt of 15 or -15.

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no no

the square root of -15 involves i

it's +/- 3.9 (rounded, obviously)

if you square 2 negative numbers, you get a positive. if you square 2 positive numbers, you get a positive, so it can be either -3.9 or 3.9