Tuesday, March 26, 2013

Find the x intercepts of the graph of y = -x^2 + 3x + 18

y= -x^2 + 3x + 18


We need to
find the x-intercept of the curve y.


The x-intercept is the
point where the curve y meets the x-axis.


Then the values
of y would be zero.


==> -x^2 + 3x + 18 =
0


==> We will factor
-1.


==> -(x^2 -3x -18) =
0


Now we will
factor.


==> -(x-6)(x+3) =
0


==> x = 6  , -3


There
are 2 values for x. Then, the curve y meets the x-axis at two points ( 6,0) and
(-3,0)


Then x-intercepts are (6,0) and
(-3,0)

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