Posted by **Anonymous ** on Saturday, September 14, 2013 at 6:36pm.

Solve for x.

-3x^2+8=-4

- PreCal -
**Steve**, Saturday, September 14, 2013 at 6:46pm
-3x^2 = -12

x^2 = 4

x = ±2

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**Anonymous **, Saturday, September 14, 2013 at 6:49pm
thanks and what about this one ?

Simplify the expression

(3x^-1y^2)^3(5x^2y)0

I'm getting confused because of the negative exponent

- PreCal -
**Steve**, Saturday, September 14, 2013 at 6:56pm
anything^0 = 1, so we just have

(3x^-1y^2)^3 = 27 x^-3 y^6 = 27y^6/x^3

negative exponents indicate a swap between numerator and denominator

x^-3 = 1/x^3

1/x^-3 = x^3

recall that x^a/x^b = x^(a-b)

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