SOLUTION: x^2-5x-7<0 Help! :)

Question 1923: x^2-5x-7<0
Help!
:)
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
easy...do not be scared of inequalities.
Solve
You cannot factorise this, so use the formula..see my recent answers on this method.
Answers here are and . These are called the roots of the equation. Note the "5+" answer is a bigger number than the "5-" number.
Now, any +x^2 graph is u-shaped and I have just found where it crosses the x-axis, so where will the curve have negative values? Well, any x value between these 2 root values (just sketch a u-shaped curve that cuts the x-axis to see what i mean, so this is your inequality answer.
< x <
Hope this makes sense.
cheers
Jon.
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