Question

. 4.  If 7x+15 = 50, then which of the following is the root of the equation?

          I.    -5

         II.    65/7

        III.    5

        IV.    1/5​

Answer 1

GIVEN :

The equation is  7x+15 = 50

TO FIND :

The root of the given equation.

SOLUTION :

Given that the equation is 7x+15=50

To find the root of the equation.

That is the root must satisfy the given equation.

i) Put x=-5 in given equation we get,

7(-5)+15=50

-35+15=50

$-20\neq 50$

∴ -5 is not a root.

ii) Put $x=\frac{65}{7}$ in given equation we get,

$7(\frac{65}{7})+15=50$

65+15=50

$80\neq 50$

∴ $\frac{65}{7}$ is not a root

iii) Put x=5 in given equation we get,

7(5)+15=50

35+15=50

50= 50

∴ 5 is a root.

Option iii) 5 is correct.

∴ 5 is the root of the given equation 7x+15=50.

Answer 2

Answer:

5 is root make brilliant answer