possibly wrong answer in the book concerning exponent simplfying?

• May 18th 2011, 03:16 PM
math69
possibly wrong answer in the book concerning exponent simplfying?
\$\displaystyle -2x^-3 * 5x^4 / 20x^-6\$

in the book the answer is\$\displaystyle -1/2x^5\$

but i got \$\displaystyle -1/2x^7\$ and so did my algebra program, the confusion is when your bring the -6 up, in the book it subtracts, can anyone shed some light?
thx

btw the -3 and -6 are neg. exponents, the program didnt bring em up for some reason sorry iam new
• May 18th 2011, 03:57 PM
Quacky
Quote:

Originally Posted by math69
\$\displaystyle -2x^-3 * 5x^4 / 20x^-6\$

in the book the answer is\$\displaystyle -1/2x^5\$

but i got \$\displaystyle -1/2x^7\$ and so did my algebra program, the confusion is when your bring the -6 up, in the book it subtracts, can anyone shed some light?
thx

btw the -3 and -6 are neg. exponents, the program didnt bring em up for some reason sorry iam new

I agree with your answer. It seems to be a straightforward application of \$\displaystyle (x^a)(x^b)=x^{a+b}\$
• May 18th 2011, 06:17 PM
math69
yea and its an example problem too, confusing