You need to solve the second order homogeneous differential equation, hence, you need to write the characteristic equation, such that:
`(d^2y)/(dx^2) = k^2`
`(dy)/(dx) = k`
`k^2 - k - 12 = 0`
You need to use the quadratic formula, such that:
`k_(1,2) = (1+-sqrt(1 + 48))/2 => k_(1,2) = (1+-sqrt49)/2`
`k_1 = 4; k_22 = -3`
Since the solutions to characteristic equation are real and different yields the general solution to the differential equation, such that:
`y = c_1*e^(k_1x) + c_2*e^(k_2x)`
`y = c_1*e^(4x) + c_2*e^(-3x)`
Hence, evaluating the general solution to the given differential equation, yields `y = c_1*e^(4x) + c_2*e^(-3x).`
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