Which equation does not belong with the other three?
• 2^x=4^(x+6)
• 5^(3x+8)=5^(2x)
• 3^4 = x +4^2
• 2^(x-7)=2^7
Explain your reasoning.
• It is the only one without an unlike base.
• It is the only one where the value of x is zero.
• It is the only one where the value of x is negative.
• It is the only one that is not an exponential equation.