8 . The graph of a quadratic function has y -intercept 150 and one of its x -intercept is � 5 . The x -coordinate of the vertex of the graph is 5 . The equation of the quadratic function is in the form
2 y � ax �bx � c .
( a ) Write down the value of c .
( b ) Write down the second x -intercept of the function .
( c ) Find the value of a and of b .
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