Question 690013
{{{f(x)=-2x^2+3x}}}


{{{f(1)=-2(1)^2+3(1)}}}


{{{f(1) = 1}}}


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{{{f(x)=-2x^2+3x}}}


{{{f(3)=-2(3)^2+3(3)}}}


{{{f(3) = -9}}}


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So 


(1, f(1)) and (3, f(3))


turns into


(1, 1) and (3, -9)


All you need to do is find the equation of the line that goes through the points (1, 1) and (3, -9). I'll let you do this.