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Mathematics 15 Online
OpenStudy (calculusxy):

Help with exponents! Question posted below... MEDAL!

OpenStudy (calculusxy):

\[\huge (x^4)^{-3} \times 2x^4\]

OpenStudy (calculusxy):

@hartnn

hartnn (hartnn):

first term \(\huge (a^b)^c = a^{bc}\)

hartnn (hartnn):

you subtracted the exponents, the rule tell us to multiply them :3

OpenStudy (anonymous):

@hartnn agree

OpenStudy (calculusxy):

Oh my godd

OpenStudy (calculusxy):

I am running our of my mind :\

OpenStudy (calculusxy):

*out

hartnn (hartnn):

\(4 \times (-3) = - (4\times 3) = .. \)

OpenStudy (calculusxy):

\[\huge x^{4 \times (-3)} = x^{-12}\]

hartnn (hartnn):

yussss

hartnn (hartnn):

now \(\huge a^b \times a ^c = a^{b+c}\)

hartnn (hartnn):

2 \((x^{-12} \times x^4) = .. ?\)

OpenStudy (calculusxy):

So here's the thing, I don't why we have to combine them... Is it because 2x^4 has two terms: 2 and x^4?

OpenStudy (jhannybean):

theres a common base, \(x\)

hartnn (hartnn):

2 is a constant, lets throw that out of the process of multiplying 'x's

OpenStudy (calculusxy):

So just to clarify, if we have like 45x^5 then i will just have to take out the 45 and work with the x being the common base with another power right?

hartnn (hartnn):

....with another term of x. yes.

OpenStudy (calculusxy):

\[\large 2(x^{-8}) = 2x^{-8}\]

OpenStudy (calculusxy):

Is that correct ?

hartnn (hartnn):

\(2 x^3 \times 45 x^5 = 2\times 45 x^{3+5}\)

hartnn (hartnn):

yes, thats correct :)

hartnn (hartnn):

2/x^8 also "looks" nice

OpenStudy (calculusxy):

My answer is \[\huge \frac{ 2 }{ x^8 }\]

hartnn (hartnn):

\(\huge \checkmark \)

OpenStudy (calculusxy):

The reason for why I have to put the x^8 to the denominator is because of the exponent of -8 right? The negative exponent tells the base to get to its reciprocal and then the exponent becomes positive?

hartnn (hartnn):

correcto! \(\Large a^{-b} = \dfrac{1}{a^b}\)

OpenStudy (calculusxy):

Thank you!

hartnn (hartnn):

welcome ^_^

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