4. What is the result of 3^2x-5x+1 from 8x^2 -2x-9? a. 5x2 +3x - 10
b. -5x2-3x -10
C. 5x2 -7X-8
d. 5x2 -7x +8

a)  5 x² + 3 x -10

Step-by-step explanation:

Explanation:-

Given polynomials

        3 x² - 5 x + 1   and 8 x² - 2 x -9

Given that  

         3 x² - 5 x + 1   From 8 x² - 2 x -9

  ⇒   8 x² - 2 x -9 - (  3 x² - 5 x + 1  )

  =    8 x² - 2 x -9 - 3 x² + 5 x - 1

  =    5 x² + 3 x -10

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

12

step-by-step explanation: