Asked by karan
The expression y=ax²+bx+c has always the same sign as of 'a' if:
Answers
Answered by
Steve
the discriminant is negative.
That means there are no real roots.
That means the graph does not cross the x-axis.
That means that the value of y never changes sign.
so, your job is to justify why that means that y and a have the same sign.
That means there are no real roots.
That means the graph does not cross the x-axis.
That means that the value of y never changes sign.
so, your job is to justify why that means that y and a have the same sign.
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