Find the indicated quantities for \( f(x)=3 \mathrm{x}^{2} \). (A) The slope of the secant line through the points \( (2, f(2)) \) and \( (6, f(6)) \). (B) The slope of the secant line through the points \( (2, f(2)) \) and \( (2+\mathrm{h}, \mathrm{f}(2+\mathrm{h})), \mathrm{h} \neq 0 \) - (C) The slope of the graph at \( (2, f(2)) \) (A) The slope of the secant line through the points \( (2, f(2)) \) and \( (6, f(6)) \) is (Type an integer or a simplfied fraction.) (B) The slope of the secant line through the points \( (2, f(2)) \) and \( (2+h, f(2+h)), \mathrm{h} \neq 0 \), is (C) The slope of the graph at \( (2, f(2)) \) is \( \square \). (Type an integer or a simplitied fraction.)
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To find the indicated quantities for \( f(x) = 3x^2 \): (A) First, we calculate \( f(2) \) and \( f(6) \): \( f(2) = 3(2)^2 = 3 \times 4 = 12 \) \( f(6) = 3(6)^2 = 3 \times 36 = 108 \) Now, the slope of the secant line through the points \( (2, 12) \) and \( (6, 108) \) is: \[ \text{slope} = \frac{f(6) - f(2)}{6 - 2} = \frac{108 - 12}{4} = \frac{96}{4} = 24 \] (B) The slope of the secant line through the points \( (2, f(2)) \) and \( (2+h, f(2+h)) \): Calculate \( f(2+h) = 3(2+h)^2 = 3(4 + 4h + h^2) = 12 + 12h + 3h^2 \). Now, the slope is: \[ \text{slope} = \frac{f(2+h) - f(2)}{(2+h) - 2} = \frac{(12 + 12h + 3h^2) - 12}{h} = \frac{12h + 3h^2}{h} = 12 + 3h \] (C) To find the slope of the graph at \( (2, f(2)) \), we need to compute the derivative \( f'(x) \): \[ f'(x) = 6x \] Thus, at \( x = 2 \): \[ f'(2) = 6(2) = 12 \] So, the answers are: (A) 24 (B) \( 12 + 3h \) (C) 12