exam Maths Puzzle Numerical Ability

the graph of the equation y=x^2+2x-8 where does it intersect the x-axis?

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will you please explain to me how to do this using an equation. i am so lost.
It says, find the slope and equation of the line through the points (-2,5) and (3,-1)
If you could help me, that would be wonderful. thank you and God bless. You conduct a survey of a sample of 25 members of this year�s graduating marketing students and find that the average GPA is 3.2. The standard deviation of the sample is
0.4. Over