HP 15c User Manual

Page 185

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Section 13: Finding the Roots of an Equation 185

Keystrokes

Display

005– 16

t / 20.

'

006– 12

007– 16

e

t / 20

.

1

008– 1

+

009– 40

1 – e

t / 20

.

5

010– 5

0

011– 0

0

012– 0

0

013– 0

*

014– 20

5000 (1 – e

t / 20

).

®

015– 34

Brings another t-value

into X-register.

2

016– 2

0

017– 0

0

018– 0

*

019– 20

200t.

-

020– 30

5000(1 – e

t / 20

) – 200t.

| n

021– 43 32

Switch to Run mode, key in two initial estimates of the time (for example, 5
and 6 seconds) and execute _.

Keystrokes

Display

Run mode.

5

v

5.0000

Initial estimates.

6

6

´_A

9.2843

The desired root.

Verify the root by reviewing the Y- and Z-registers.

Keystrokes

Display

)

9.2843

A previous estimate of the root.

)

0.0000

Value of the function at the root
showing that h = 0.

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