The equation of the curve is
Q) Find the coordinates of the stationary point of the curve.
I know that I am supposed to express this equation in the form and then get the values of b for x and a for y to get the answer. But what are stationary points? Is that the vertex?
Q) Find the set of values of x for which y is greater than equal to -20
I've got the final answer
(x+2)(x-10) is less than or equal to 0
x= -2 or x= 10
Now what I don't understand is what is the sketch method? And how to easily find out which of the two (-2 or 10) is less than or equal to x or which one is greater than or equal to x.
Thanks a lot in advance.