Q18. If 3x - 1/3x = 7 find the value of 3x+1/3x
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Answer:
-5
Step-by-step explanation:
3x-1/3x=7
=> 3x-1 = 21x (By cross multiplication)
=> 3x-21x = 1
=> 18x = 1
=> x = - 1/18
then,
3x+1/3x
= (3 × -1/18) + 1 / (3 × -1/18) [Hence: x = -1/18]
= -1/6 + 1 × -1/6 [By simplification ]
= -1+6/6 × 6/-1
= 5/6 × 6/-1 [By further simplification]
= -5
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