Question

solve 15-4x=7,x=2,-2,1​

Answer 1

Answer:

7,23 and 11

Step-by-step explanation:

15-4x

let x=2

15-4.2

15-8

7

let x=-2

15-4(-2)

15-(-8)

15+8

23

let x=1

15-4.1

15-4

11

Answer 2

Answer:

i) 7 ii) 23 iii) 11

Explanation:

Note : L.H.S (Left Hand Side)

R.H.S (Right Hand Side)

i) Substituting x = 2 in L.H.S

If x = 2

L.H.S = 15 - 4 × 2

= 15 - 8

L.H.S = 7

R.H.S = 7

x = 2 is the Solution for given equation.

ii) Substituting x = -2 in L.H.S

If x = -2

L.H.S = 15 - 4 × (-2)

= 23

R.H.S = 7

x = -2 is not the solution for given equation.

ii) Substituting x = 1 in L.H.S

If x = 1

L.H.S = 15 - 4 × 1

= 11

R.H.S = 7

x = 1 is not the solution for given equation.

Therefore, i) sum is the solution of the given question.

Answer 3

i) 7 ii) 23 iii) 11

Note : L.H.S (Left Hand Side)

R.H.S (Right Hand Side)

i) Substituting x = 2 in L.H.S

If x = 2

L.H.S = 15 - 4 × 2

= 15 - 8

L.H.S = 7

R.H.S = 7

x = 2 is the Solution for given equation.

ii) Substituting x = -2 in L.H.S

If x = -2

L.H.S = 15 - 4 × (-2)

= 23

R.H.S = 7

x = -2 is not the solution for given equation.

ii) Substituting x = 1 in L.H.S

If x = 1

L.H.S = 15 - 4 × 1

= 11

R.H.S = 7

x = 1 is not the solution for given equation.

Therefore, i) sum is the solution of the given question.