X to the 0 power = 1, as long as X is any real number other than 0.
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x^0 = 1 for all x. The derivative of 1 is always zero.
2.67676364564. Multiply the power of x by the coefficient, and lower the power of x by 1, which is x to the 0 power, or 1.
1.682 x 10^0 1.682 x 10^0
Your expression simplifies to just x^2 {with the restriction that x > 0}. The derivative of x^2 is 2*x
x2 - 3x - 4 = 0 so (x+1)(x-4) = 0, so x+1 = 0 and x-4 = 0, so x = -1 or 4