Let \( f(x)=6 x+2 \) and \( g(x)=3 x-5 \). Write a formula for each of the following functions and then simplify. a. \( f+g=\square \) b. \( f-g=\square \) c. \( g-f=\square \) d. \( g+f=\square \) e. \( f g=\square \) \( f . f f=\square \)
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Let's calculate the functions step-by-step: a. \( f + g = (6x + 2) + (3x - 5) = 9x - 3 \) b. \( f - g = (6x + 2) - (3x - 5) = 6x + 2 - 3x + 5 = 3x + 7 \) c. \( g - f = (3x - 5) - (6x + 2) = 3x - 5 - 6x - 2 = -3x - 7 \) d. \( g + f = (3x - 5) + (6x + 2) = 3x - 5 + 6x + 2 = 9x - 3 \) e. \( f \cdot g = (6x + 2)(3x - 5) = 18x^2 - 30x + 6x - 10 = 18x^2 - 24x - 10 \) f. \( f \cdot f \cdot f = (6x + 2)(6x + 2)(6x + 2) \) Calculating \( (6x + 2)(6x + 2) = 36x^2 + 24x + 4 \), then multiplying by \( (6x + 2) \): \[ (36x^2 + 24x + 4)(6x + 2) = 216x^3 + 72x^2 + 24x + 144x^2 + 48x + 8 \] Combining the like terms: \[ = 216x^3 + (72x^2 + 144x^2) + (24x + 48x) + 8 = 216x^3 + 216x^2 + 72x + 8 \] So the final answer for \( f \cdot f \cdot f \) is \( 216x^3 + 216x^2 + 72x + 8 \).