If 5x + (1/3x) = 4, then what is the value of 9x2 + (1/25x2) ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e 114/25.
| Understanding/Application |
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5x + (1/3x) = 4 Multiplying both sides by 3/5 3x + (1/5x) = 12/5 |
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Squaring both sides - {3x + (1/5x)}2 = (12/5)2 9x2 + 1/25x2 + 6/5 = (144/25) 9x2 + 1/25x2 = (144/25) - (6/5) 9x2 + 1/25x2 = 114/25 |