Which function is greatest at x = 3?

Question

f(x) = 4x 

f(x) = x to the power of 4

f(x) = 3 times x to the power  of 4

 

Answer 1

x = 3

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4x = 4(3) = 12

x⁴ = 3⁴ = 81

3x⁴ = 3(3⁴) = 3(81) = 243