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186 Section 13: Finding the Roots of an Equation

Fahr's ridget falls to the ground

9.2843 seconds after he hurls ita

remarkable toss.

When No Root Is Found

You have seen how the _ key estimates and displays a root of an

equation of the form f(x) = 0. However, it is possible that an equation has no

real roots (that is, there is no real value of x for which the equality is true).

Of course, you would not expect the calculator to find a root in this case.

Instead, it displays Error 8.

Example: Consider the equation

|x| =  1.

which has no solution since the absolute

value function is never negative. Express

this equation in the required form

|x| + 1 = 0

and attempt to use _ to find a

solution.

Keystrokes

Display

| ¥

000–

Program mode.

´b 1

001–42,21, 1

| a

002– 43 16

003– 1

004– 40

| n

005– 43 32

HP HP-15C User Manual

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