Question

Simplify the expression.
-20a-2b-7
5a-5b3

Answer 1

Answer:

(-20a+2b-7, 5a+5b^3)

Step-by-step explanation:

Use vector arithmatic to simplify

Answer 2

Answer:

$\frac{-4a^3}{b^{10} }$

Step-by-step explanation:

Step 1: Write out the expression separately. Like so:

-20 $a^{-2}$ $b^{-7}$                              5 $a^{-5}$  $b^{3}$

Step 2: Since the it's a fraction were dividing. The bases of the exponents are the same, so you can divide the numbers and subtract the exponents.

-20  ÷  5 = -4    

$a^{-2}$  -  $a^{-5}$ = $a^{3}$

$b^{-7}$ -  $b^{3}$    = $b^{-10}$

Step 3: Notice that there is a negative exponent. To get rid of the negative, you have to make it positive and move it from being the numerator to being the denominator.

$b^{-10}$ →→→ $b^{10}$

Step 4: Rewrite the expression with the -4, $a^{3}$ , and $b^{10}$.

$\frac{-4a^{3} }{b^{10} }$  

hope this helps  :)