Question

8. The sum of twice an unknown, x, times itself added to seven times that unknown is -3. Which
of the following could be the value of the unknown x?
(A) -2
(B)2
(C) -3
(D) 3 (E)

Answer 1

Answer:

No A,B,C, or D              Answer E  (other)  -3/9

Step-by-step explanation:

2x+7x=-3

9x=-3

x=-3/9

-3/9*2=-6/9

-3/9*7=-21/9

ADD BOTH  

-27/9=-3

Answer 2

The value of the unknown x is -1/3.

Option E is the correct answer.

How do you calculate the value of unknown x?

Give sum has a value of -3. This sum is equivalent to the twice of unknown x added to 7 times of that unknown x. The equation form of the given sum will be,

$2x + 7x =-3$

Simplifying the above equation as given below.

$9 x = -3$

$x = -\dfrac {3}{9}$

$x = -\dfrac {1}{3}$

Thus the value of unknown x is -1/3. Hence, option E is correct.

To know more about the sum, follow the link given below.

https://brainly.com/question/641910.