(Solved): For the given function, find (a) the equation of the secant line through the points where \( \mathr ...

For the given function, find (a) the equation of the secant line through the points where \( \mathrm{x} \) has the given values and (b) the equation of the tangent line when \( x \) has the first value. \[ y=f(x)=x^{2}+x ; x=-4, x=-2 \] a. Which of the following formulas can be used to find the slope of the secant line? A. \( \frac{-2+(-4)}{f(-2)+f(-4)} \) B. \( \frac{f(-2)+f(-4)}{-2+(-4)} \) C. \( \frac{-2-(-4)}{f(-2)-f(-4)} \) D. \( \frac{f(-2)-f(-4)}{-2-(-4)} \) The equation of the secant line is