Please, I need help fast! n²-4-n-2 is equal to
A) (n-2)n
B) (n-2)(n+1)
C) (n+2)(n-3)
D) (n+2)n

And please write good explanation, not only the answer. Thank you!

C. (n+2)(n-3)

Step-by-step explanation:

n^2 - 4 - n - 2 = n^2 - n - 6

n = (-(-1) ± √(-1)^2 - 4(1)(-6))/(2(1)) = (1 ±√25)/2 = 6/2 or = -4/2

therefore, n = 3 or n = -2

therefore, n^2 - n - 6 = (n+2)(n-3)

This is a question on solving quadratic equations using a kind of formula. If you wish to venture further into it/understand this topic better, you may want to follow my Instagram account (learntionary), where I post some of my own notes on certain topics and also some tips that may be useful to you :)

6.9

step-by-step explanation:

simple math really

6 1/2 times 0.6 = 3.9

but if you are just doing 6 and not 6 1/2 then the answer is 3.6

(x3 + 6x2 + 2x - 6) • (x - 1)

step-by-step explanation:

polynomial long division :

3.2     polynomial long division

dividing :   x4+5x3-4x2-8x+6

                              ("dividend")

by         :     x-1     ("divisor")

dividend     x4   +   5x3   -   4x2   -   8x   +   6

- divisor   * x3     x4   -   x3            

remainder         6x3   -   4x2   -   8x   +   6

- divisor   * 6x2         6x3   -   6x2        

remainder             2x2   -   8x   +   6

- divisor   * 2x1             2x2   -   2x    

remainder               -   6x   +   6

- divisor   * -6x0               -   6x   +   6

remainder                     0

quotient :   x3+6x2+2x-6   remainder:   0