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KNOWING OUR NUMBERS
WHOLE NUMBERS
PLAYING WITH NUMBERS
BASIC GEOMETRICAL IDEAS
UNDERSTANDING ELEMENTARY SHAPES
INTEGERS
FRACTIONS
DECIMALS
DATA HANDLING
MENSURATION
ALGEBRA
RATIO AND PROPORTION
SYMMETRY
PRACTICAL GEOMETRY
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When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$ <math...
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