Question 20

Fill in the blanks to make each statement true:

9x- ............... =-21 has the solution (-2).

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Solution

3
Let 9x-m=-21 has the solution (-2).
Since, x=-2 is the solution of the equation.
$∴ 9 \times (- 2) - m = - 21 \Rightarrow - 18 - m = - 21 \Rightarrow - 18 + 21 = m \Rightarrow m = 3$
Hence, 9x-3=-21 has the solution(-2).

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