GCSE Maths Notes by Haynes A

Author:Haynes, A [Haynes, A]
Language: eng
Format: epub
Publisher: andychains.com
Published: 2013-12-06T16:00:00+00:00

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Chapter 11

SOLVING EQUATIONS USING GRAPHS

EQUATIONS CHANGED TO LINEAR GRAPHICAL FORM

TRANSFORMATION OF FUNCTIONS/GRAPHS

GRAPHS AND INEQUALITIES

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SOLVING EQUATIONS USING GRAPHS - contents A quadratic equation

When we 'solve' and equation such as x 2 - 4 = 0, this means that we find the value(s) of x which make the equation true.

We can solve the above equation by isolating the x by itself on the left of the equal sign. Thus,

x 2 - 4 = 0, so

x 2 = 4 (taking the -4 across and changing its sign), so

x = + 2 or -2

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