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Help with Maths please D:?
I am having problems with maths can havee solutions or answers, i having problems with this question 27^-2/3 i know without the negative its a 9 but that'ss all =[.
Also how do you go about this question √48 - √27 + 5√350
i got the 48 simplified down to 4√3 and the √27 down to 3√3 but stuck after then :( Explanationpreferreded, though if the answer comes out of one then ain'tnt fussed,
Thanks in advance.
2 Answers
- Anonymous1 decade agoFavorite Answer
A negative exponent becomes positive if you make it the denominator of a fraction (if it's a numerator or a whole number) and a numerator if its a denominator.
Simply put 27^-2/3 = 1/(27^2/3) = 1/cuberoot of 729 = 1/9
The second one can be easily solved by getting the factors of the numbers inside the square root. Notice that
√48 = √(16)(3) but √16 = 4 so √(16)(3) = 4√3
√27 = √(9)(3) but √9 = 3 so √(9)(3) = 3√3
5√350 = 5√(25)(14) but √25 = 5 so 5X5√14 = 25√14
Therefore
4√3 - 3√3 + 25√14 = √3 + 25√14
can't combine them anymore so that is your final answer.
Source(s): http://www.freewebs.com/teacherray - sarahLv 51 decade ago
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