In the xy plane, at what two points does the graph of y= (x+a)(x+b) intersect the x axis?
(1) a+b=-1
(2) the graph intersects the x=axis at at (0,6)
i chose E but the answer is c
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f2001290
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When a line intersects X axis, y = 0
1. y = x^2 + (a+b)x + ab - not sufficient
2. Substitute (0,6) in the equation, we get the value of ab.
Using both the statements
x^2 - x + 6 = 0
we can get two values of x by solving this equation
1. y = x^2 + (a+b)x + ab - not sufficient
2. Substitute (0,6) in the equation, we get the value of ab.
Using both the statements
x^2 - x + 6 = 0
we can get two values of x by solving this equation
