Question

Find the difference and enter it in the box below.

(3x7 + 6x4 - 5x + 7) - (6x4 - 5x3 + 7)

can someone plz take a look at this one i tried and i cant get an answer for it

Answer 1

(3x^7 + 6x^4 - 5x + 7) - (6x^4 - 5x^3 + 7)

sorry the problwm should look like this

Answer 2

can someone please help me i couldn"t get an answer for it

Answer 3

ok so first you should distribute the negative on the second parenthesis
you end up with
3x^7 + 6x^4 -5x + 7 - 6x^4 +5x^3 -7

some terms cancel from addition and subtraction and so simplify
3x^7 + 5x^3 - 5x

Answer 4

ok thank you i first added the xs together to get 9x^11

Answer 5

oh no you cant do that

Answer 6

they are exponents...you cant add them unless they have the same base

Answer 7

correction: you cant add them unless they are multiplied or divided by each other with the same base

Answer 8

oh yea sorry i forgot

Answer 9

so walk me throught it please

Answer 10

ok so you have two sets of parenthesis and the second one is all subtracted from the first one
so what you do is since the entire thing is subtracted, you can get rid of the parenthesis through distribution of the minus sign, so you multiply each term by -1 in the second parenthesis

then you end up with 3x^5 + 6x^4 - 5x + 7 -6x^4 + 5x^3 - 7

and so now look at terms that have the same exponent. look at x^4, you are adding 6x^4 and you are subtracting 6x^4 and so if you add and subtract the same thing, its like adding zero, so they cancel each other. then you also have some constants doing the same thing so the 7's will cancel.
cleaning up what we now have is
3x^7 + 5x^3 - 5x
now look at the exponents. you have a degree of 7, 3, and 1. since none are equal, you cannot combine further.
therefore you are left with exactly that.

Answer 11

i think i got it ill try the next one

Answer 12

Which polynomial represents the difference below?

10x^8 + 11x^6 - 2x + 5 - (8x^8 + 6x^7 - 5)

A. 2x^8 - 6x^7 + 11x^6 - 2x + 10
B. 18x^8 -17x^7 + x6 - 2x + 10
C. 2x^0 + 5x^1 - 2x
D. 2x^8 - 6x^7 + 9x^6 - x + 10

Answer 13

ok here is one i cannot get

Answer 14

is the answer b

Answer 15

ok so its kind of the same thing we just did
distribute the negative
10x^8 + 11x^6 - 2x + 5 - 8x^8 - 6x^7 + 5

notice you have terms with x^8 so you can subtract the coefficients 10 - 8 = 2
then look at the constants. you have a +5 and a + 5 so you have 10. they dont cancel this time!
so you are left with 2x^8 - 6x^7 +11x^6 -2x + 10

so the answer is A

Answer 16

:) ok i get it now

Answer 17

ok i hope it helped...if you didnt understand i can try to explain again

Answer 18

no i did thank you for your help