Solve the following equations: |
(a) 2 (x + 4) = 12 |
(b) 3 (x - 5) = 21 |
(c) 3 (x - 5) = -21 |
Answer:
(a) 2(x + 4) = 12 \[x+4=\frac{12}{2}\] x + 4 = 6 x = 6 ? 4 \[\therefore \] x = 2 (b) 3(x ? 5) = 21 \[x5=\frac{21}{3}\] x ? 5 = 7 x = 7 + 5 \[\therefore \] x = 12 1 (c) 3(x ? 5) = ? 21 \[x5=\frac{21}{3}\] x ? 5 = ? 7 x = ? 7 + 5 \[\therefore \] x = ? 2
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