hp 39gs how to solve a quadratic equation
04-30-2018, 06:38 AM
Post: #1
 yong han Junior Member Posts: 1 Joined: Apr 2018
hp 39gs how to solve a quadratic equation
how to solve quadratic equation? solve this problem x^2+5=0. answer x=+-5i
i use solve aplet and quad explorer but it's not answer
how to solve this equation?
04-30-2018, 05:53 PM (This post was last modified: 04-30-2018 06:00 PM by ijabbott.)
Post: #2
 ijabbott Senior Member Posts: 771 Joined: Jul 2015
RE: hp 39gs how to solve a quadratic equation
(04-30-2018 06:38 AM)yong han Wrote:  how to solve quadratic equation? solve this problem x^2+5=0. answer x=+-5i
i use solve aplet and quad explorer but it's not answer
how to solve this equation?

You can use POLYROOT([1,0,5]). The list inside the square brackets is the coefficients of the polynomial whose roots you wish to find. The result is a 1 by n matrix (for an nth degree polynomial) containing the roots. Note that a complex number is represented as an ordered pair of numbers in parentheses - (real,imag). For example 3+2i is represented as (3,2).

For example, POLYROOT([1,0,5]) => [(0,2.2360679775),(0,-2.2360679775)].
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