Answer:
2.(b) w= 3
3. x= -3 or x= 3
Explanation:
2.(b) Method 1:

Simplify:

×5 on both sides:

Expand:

Bring constants to 1 side, w terms to the other:

Simplify:

Divide both sides by 3:

Method 2:

Multiply by 5 throughout:

Expand:

Simplify:

+9 on both sides:

-4w on both sides:

Simplify:

Divide by 3 on both sides:

3.

Multiply by 3x on both sides:

Expand:

Simplify:

Divide by 6 on both sides:

-9 on both sides:

Factorise:
*Since a²-b²= (a +b)(a -b),

Thus,
x +3= 0 or x -3= 0
x= -3 or x= 3