SOLUTION: Find the Vertex and x-intercept(s) of: f(x)=12x^2+15x

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Question 1128693: Find the Vertex and x-intercept(s) of:
f(x)=12x^2+15x

Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
12x%5E2%2B15x
3x%284x%2B5%29
x intercepts are -5%2F4 and 0.



Vertex occurs for x=-5%2F8.

12%285%2F8%29%5E2-15%2A5%2F8
12%2A25%2F8%5E2-15%2A5%2A8%2F8%5E2
%2812%2A25-15%2A40%29%2F8%5E2
-300%2F64
-150%2F32
highlight%28-75%2F16%29---------value of y at the vertex
( -5/8, -75/16 ) vertex