Sketches Of Some Important Graphs

The following are sketches of the graphs of the functions in the form
ax + by = c
y = ax² + bx + c
y = ax³ + b
y = ax³ + bx² + cx
y = a/x + b
y = ar^x + b
where a, b and c are rational numbers and r is a rational, positive number.
Take note of the x-intercept(s), y-intercept(s), turning points, roots, symmetry, vertical and horizontal asymptotes.

 

These are some basic graphs that every algebra student should know.

1. y = mx + b (Linear Function)
2. y = x² (parabola)
3. y = xⁿ
4. y = absolute value of x
5. y = square root of x
6. y =
7. y =
8. y = log_b(x), where b > 1
9. y = a^x

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This video shows the graphs for the following functions:

1. f(x) = x
2. f(x) = x²
3. f(x) = x³
4. f(x) = square root of x 5*. f*(x) = cube root of x
5. f(x) = absolute value of x

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How to sketch a cubic graph? (without using calculus)
Sketching the graph of a cubic function involves understanding its key features and using them to plot a representative curve.

1. Determine the End Behavior:
   Look at the Leading Coefficient (a): In the general form f(x) = ax³ + bx² + cx + d:
   If a > 0:
   As x → ∞, f(x) → ∞ (rises to the right)
   As x → -∞, f(x) → -∞ (falls to the left)
   If a < 0:
   As x → ∞, f(x) → -∞ (falls to the right)
   As x → -∞, f(x) → ∞ (rises to the left)
   
2. Find the Intercepts:
   y-intercept:
   Set x = 0 in the function and solve for f(x). This gives you the point (0, f(0)).
   x-intercepts (Roots or Zeros):
   Set f(x) = 0 and solve for x.
   This can be more challenging for cubic functions.
   In some cases, you may be given the roots or the equation is given in factored form otherwise you would need to factor the the cubic equation.
   
3. Plot the Points and Sketch the Graph:
   Plot the intercepts on a coordinate plane.
   Use the end behavior as a guide as to what the “S” like curve will look like.
   

Note:
Calculus is essential for accurately locating critical points and inflection points. Without calculus, you can get a general idea of the shape, but not the precise locations of turning points.

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How to graph cubic functions using calculus?

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Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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