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Question 2.5.8: Solving an Equation with a Graphing Calculator Use a graphin...

Solving an Equation with a Graphing Calculator

Use a graphing calculator to solve -2x – 4(2 – x) = 3x + 4.

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We write an equivalent equation with 0 on one side.

-2x – 4(2 – x) – 3x – 4 = 0   Subtract 3x and 4.

Then we graph y = -2x – 4(2 – x) – 3x – 4 to find the x-intercept. The standard viewing window cannot be used because the x-intercept does not lie in the interval [ -10, 10]. As seen in Figure 51, the solution of the equation is -12, and the solution set is {-12}.

51

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