Problem 834. Solve Quadratic : No * - or key functions permitted

Created by Richard Zapor

Solve Later

{"relationships":[{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/document","targetMode":"","relationshipId":"rId1","target":"/matlab/document.xml"},{"relationshipType":"http://schemas.mathworks.com/matlab/code/2013/relationships/output","targetMode":"","relationshipId":"rId2","target":"/matlab/output.xml"}],"parts":[{"partUri":"/matlab/document.xml","relationship":[],"contentType":"application/vnd.mathworks.matlab.code.document+xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<w:document xmlns:w=\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\"><w:body><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Solve the quadratic equation</w:t></w:r><w:r><w:t> </w:t></w:r><w:r><w:rPr><w:b/></w:rPr><w:t>ax^2+bx+c=0</w:t></w:r><w:r><w:t>. However, some of the normal functions and symbols are not allowed.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>x=[ -b +/- sqrt ( b^2 - 4ac ) ] / ( 2a )</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Unallowed functions and symbols:</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>roots mtimes cross prod cumprod times mldivide mrdivide dot numstr int2str dec2bin * / \\ - ^ '</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Derivative of Aurelien's</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.com/matlabcentral/cody/problems/813-multiply-2-numbers\"><w:r><w:t>Cody 813 Multiply 2 numbers</w:t></w:r></w:hyperlink></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Also related to</w:t></w:r><w:r><w:t> </w:t></w:r><w:hyperlink w:docLocation=\"http://www.mathworks.com/matlabcentral/cody/problems/833-find-third-side-of-a-right-triangle-given-hypotenuse-and-a-side-no-or-other-functions-allowed/solutions/map\"><w:r><w:t>Cody 833 Side of a Triangle</w:t></w:r></w:hyperlink></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Test suite \"disallowed function usage check\" courtesy of Aurelien Queffurust.</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>Example :</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Input</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:t>a= 1; b= 1; c=1</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"text\"/></w:pPr><w:r><w:rPr><w:b/></w:rPr><w:t>Output</w:t></w:r></w:p><w:p><w:pPr><w:pStyle w:val=\"code\"/></w:pPr><w:r><w:t><![CDATA[ x(1)= -0.5+0.866i; x(2)= -0.5-0.866i]]></w:t></w:r></w:p></w:body></w:document>"},{"partUri":"/matlab/output.xml","contentType":"text/xml","content":"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\" ?><embeddedOutputs><metaData><evaluationState>manual</evaluationState><layoutState>code</layoutState><outputStatus>ready</outputStatus></metaData><outputArray type=\"array\"/><regionArray type=\"array\"/></embeddedOutputs>"}]}

Solve

Solution Stats

162 Solutions
30 Solvers

Last Solution submitted on Jul 27, 2021

Last 200 Solutions

Problem Comments

1 Comment

1 Comment

James on 18 Jul 2012

Just as a heads up, your final answer should be in a row vector, and not a column vector.

Problem Recent Solvers30

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Problem 834. Solve Quadratic : No * - or key functions permitted

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers30

Suggested Problems

More from this Author260

Problem Tags

Community Treasure Hunt

Problem 834. Solve Quadratic : No * - or key functions permitted

Solution Stats

Last 200 Solutions

Problem Comments

Problem Recent Solvers30

Suggested Problems

More from this Author260

Problem Tags

Community Treasure Hunt

Players