Function a is linear, the equation is y = 5/3x or y=5/3x+0
We first calculate the expression for (g - f)(x) by subtracting f from g: 6x - (4 - x^2) = x^2 + 6x - 4
Then since we need to calculate the value for x = 3:
(g - f)(3) = 3^2 + 6(3) - 4 = 9 + 18 - 4 = 23
Therefore, (g - f)(3) = 23.
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Hope this helps! I though writing everything down on paper would be more beneficial