No, you do not, you change all of the x's in the function to zeros and mulitply. Whatever you are left with that is equal to y is the answer, such as.
y= x^2 + 4x+5 y= 0^2 + 4(0) + 5
y=5 the answer can also equal zero if you do not have a y intercept.
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All differentiable functions need be continuous at least.
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A number of things are to be found when solving quadratics.Firstly, the x values, or zeros, need to be found to see where the function crosses the x-axis.The y-intercept can be found when x is 0.Whether it opens upwards or down, wide or narrow, domain or range, and much more.
No, they need not be.
Standard. You need a linear equation in two variables for slope-intercept form.