Simplifying expression 4x^2 - 5x+ 9x^2 - 12x A.- 4x
B. 5x^2– 7x
C. 13x^2- 17x
D.5x^2 + 17x

C. 13x^2 - 17x

Step-by-step explanation:

1. Collect like terms -

  4x^2 - 5x + 9x^2 - 12x

= 13x^2 - 5x - 12x

2. Collect like terms again -

   13x^2 - 5x - 12x

= 13x^2 - 17x

So, the answer is 13x^2 - 17x I hope this helps! :D

answer for #1 is c

answer for #2 is d

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step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for