Find the x-intercept(s) and the coordinates of the vertex for the parabola y=x² - 4x - 21. If there is more than one x-intercept, separate them with commas.

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is

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you need to rotate this triangle about the origin 270 degrees clockwise to create the full square.