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Question
Which of the following is not true?
Options
(7 + 8) + 9 = 7 + (8 + 9)
(7 × 8) × 9 = 7 × (8 × 9)
7 + 8 × 9 = (7 + 8) × (7 + 9)
7 × (8 + 9) = (7 × 8) + (7 × 9)
Solution
7 + 8 × 9 = (7 + 8) × (7 + 9)
Explanation:
We have, 7 + 8 × 9 = (7 + 8) × (7 + 9)
LHS = 7 + 8 × 9 = 7 + 72 = 79
RHS = (7 + 8) × (7 + 9) = 15 × 16 = 240
∴ 79 ≠ 240
∴ LHS ≠ RHS So, it is false.
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