Subtract -2k3 + k2 - 9 from 5k3 - 3k + 7.

2 answers:

8 0

5k3-3k+7-(-2k3+k2-9)
basically rewrite with simple algebra principles
15k-3k+7-(-6k+2k-9)
split up the parenthesis
15k-3k+7+6k-2k+9
sort them
15k-3k+6k-3k+7+9
short down by adding up the similar factors
answer: 18k+18
factorise
18(k+1)
both forms are right

Sever21 [200]3 years ago

7 0

Answer: The required value is $7k^3-k^2-3k+16.$

Step-by-step explanation: We are given to subtract the polynomial $-2k^3+k^2-9$ from $5k^3-3k+7.$

That is, we need to find the value of S, where

$S=(5k^3-3k+7)-(-2k^3+k^2-9)~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)$

To perform the given subtraction, we need to combine the like terms as follows :

$S\\\\=(5k^3-3k+7)-(-2k^3+k^2-9)\\\\=5k^3-3k+7+2k^3-k^2+9\\\\=(5+2)k^3-k^2-3k+(9+7)\\\\=7k^3-k^2-3k+16.$

Thus, the required value is $7k^3-k^2-3k+16.$

You might be interested in

An 8 foot length of 4 inch wide crown molding costs $16. How much will it cost to buy 40 feet of crown molding?

malfutka [58]

Converting feet to inches, 8*12=96 and 96*4=384. Next, 40*12=480. Since 384*x (if x represents the cost per inch of crown molding)=16*100=1600 cents due to that for every inch, we add x amount of money, we can find x to be 1600/384=800/192=400/96=200/48=100/24=50/12=25/6 by simply dividing both the numerator and denominator by 2 each time. Since we add x amount of money for every inch, and we have 480 inches, 480*x=480*25/6=2000 cents=2000/100=20 dollars is our answer

6 0

3 years ago

PLSSSSSS HELLPPPPPPPPPPP

CaHeK987 [17]

Answer:

400+1200

1600inches^2

6 0

2 years ago

6. Find the missing value. Show your work.

Olegator [25]

1. 45 degree angle. 2. 20* same as the bottom do to the top.