Question

9. Solve the equation.

x + 4 = 3(3x - 4)
A 9
4
B 1
C 2
Lounge
D 7
4

Answer 1

x = 2

Explanation:

x + 4 = 3(3x - 4)

Expand the brackets.

x + 4 = 9x - 12

Add -x and 12 on both sides.

4 + 12 = 9x - x

16 = 8x

Divide 8 into both sides.

16/8 = x

2 = x

Switch sides.

x = 2

Answer 2

x=2

Explanation:

x + 4 = 3(3x - 4)

Distribute

x+4 = 9x -12

Subtract x from each side

x+4 -x = 9x-x-12

4 = 8x-12

Add 12 to each side

4+12 = 8x-12+12

16 = 8x

Divide by 8

16/8 = 8x/8

2 =x