help
select the x coordinate of the vertex of paraloa defined by function f(x) -5x^2+7x+3
stck between two options
=5/7 or -7/5
If f(x) -5x^2+7x+3 mean:
f ( x ) = - 5 x ^ 2 + 7 x + 3
Then :
f ( x ) = a x ^ 2 + b x + c
f ( x ) = - 5 x ^ 2 + 7 x + 3
a = - 5 , b = 7 , c = 3
The x coordinate of the vertex ;
x = - b / 2 a
x = - 7 / ( 2 * ( - 5 ) )
x = - 7 / - 10 = 7 / 10