Question 20
Fill in the blanks to make each statement true:
9x- ............... =-21 has the solution (-2).
3
Let 9x-m=-21 has the solution (-2).
Since, x=-2 is the solution of the equation.
∴9×(−2)−m=−21⇒−18−m=−21⇒−18+21=m⇒m=3
Hence, 9x-3=-21 has the solution(-2).