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Question
Pick out the solution from the values given in the bracket next to each equation. Show that the other values do not satisfy the equation.
r − 4 = 0 (4, − 4, 8, 0)
Solution
r − 4 = 0
r = 4 is a solution to the given equation because for r = 4,
r − 4 = 4 − 4 = 0 and hence, the equation is satisfied.
r = −4 is not a solution to the given equation because for r = −4,
r − 4 = − 4 − 4 = −8 and not 0
r = 8 is not a solution to the given equation because for r = 8,
r − 4 = 8 − 4 = 4 and not 0
r = 0 is not a solution to the given equation because for r = 0,
r − 4 = 0 − 4 = −4 and not 0
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m
5
6
7
8
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12
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m − 7
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