A quadratic equation is written in four equivalent forms below.

I. y = x(x + 6) - 8(x + 6)
II. y = (x - 1)2 - 49
III. y = x2 - 2x - 48
IV. y = (x + 6)(x - 8)

Which of the forms shown above would be the most useful if attempting to find the y-intercept of the quadratic equation?

Answer: III. y = x^2 - 2x - 48

The y intercept are the points on the graph where the curve hits the y-axis, so it’s the point where x=0
With the equation y=x^2 - 2x - 48 we can easily plug in 0 for x and see that the when x is zero, y is -48.

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A quadratic equation is written in four equivalent forms below. I. y = x(x + 6) - 8(x + 6) II. y = (x - 1)2 - 49 III. y = x2 - 2x - 48 IV. y = (x + 6)(x - 8) Which of the forms shown above would be the most useful if attempting to find the y-intercept of the quadratic equation?

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A quadratic equation is written in four equivalent forms below.

I. y = x(x + 6) - 8(x + 6)
II. y = (x - 1)2 - 49
III. y = x2 - 2x - 48
IV. y = (x + 6)(x - 8)

Which of the forms shown above would be the most useful if attempting to find the y-intercept of the quadratic equation?