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Mathematics 8 Online
OpenStudy (anonymous):

(-2x^3)^-2

OpenStudy (anonymous):

ok since the exponent is outside the parenthesis you would distribute it inside the parenthesis, any idea how to do that?

OpenStudy (anonymous):

no not really

OpenStudy (anonymous):

You would multiply the exponents so -2x^-6 do you know what you would do to the whole #?

OpenStudy (anonymous):

\((-2x^3)^{-2}\) This can be expanded out to make it easier to understand. \((-2\times x\times x \times x)^{-2}\)

OpenStudy (anonymous):

\(x^2 = x \times x\) \((x^2)^2 = x^2 \times x^2 = x \times x \times x \times x\)

OpenStudy (anonymous):

@jamie_ballenger does this make sense?

OpenStudy (anonymous):

I would make the-2 positive right

OpenStudy (anonymous):

2 negatives make a positive

OpenStudy (anonymous):

Yes, 2 negatives make a positive.

OpenStudy (anonymous):

Think about what you are multiplying.

OpenStudy (anonymous):

2x^-6?

OpenStudy (anonymous):

Not quite.

OpenStudy (anonymous):

The entire term is being raised to the -2 power, not just the x.

OpenStudy (anonymous):

4x^-6

OpenStudy (anonymous):

Closer, but remember the negative exponent, the negative can't just disappear.

OpenStudy (anonymous):

im lost

OpenStudy (anonymous):

\(x^{-1} = \dfrac{1}{x}\)

OpenStudy (anonymous):

Distribute the exponent: \((-2)^{-2} \times x^{-6} =\)

OpenStudy (anonymous):

\(-2 \times -2 = 4\) but that 4 still needs a -1 exponent.

OpenStudy (anonymous):

A negative exponent inverts the fraction.

OpenStudy (anonymous):

A little more clear yet?

OpenStudy (anonymous):

yes

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