exam Maths Puzzle Numerical Ability

X^2+6X
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3X^2+6X-24

*

X^2+2X-8
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X+6

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exam Other Question

Given f(x)=3(4)(^x-3)+8, what is the value of x when f(x)=14??? I think the answer is 3.5?????????? Solve 5^(2x+1) >or= 50.