X^2+8x+1<0 Inequality questions What will be the answer ? Plz tell
2 Answers
Explanation:
Complete the square:
If
If
So we have two ranges for
We can combine these to make one range:
Numerically, to three significant figures:
Explanation:
First, solve the quadratic equation f(x) = 0, to find the 2 end-points (critical points).
There are 2 real roots:
The graph of f(x) is a upward parabola (a > 0). Between the 2 real roots (x1 , x2), the graph is below the x-axis --> f (x) < 0.
The answer is the open interval: