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What is a equation?

By Jack Putt on the 11th of June, 2012

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An equation says that two things are equal. It will have an equals sign "=" like this:

 x + 2 = 6

That equations says: what is on the left (x + 2) is equal to what is on the right (6)

So an equation is like a statement "this equals that"

By Parvathy Neelakantan on the 16th of January, 2013

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In mathematics, an expression that represents the equality of two expressions involving constants and/or variables, and thus usually includes an equals (=) sign. For example, the equation A = πr2 equates the area A of a circle of radius r to the product πr2. This is also known as the formula for the area of a circle. The algebraic equation y = mx + c is the general one in coordinate geometry for a straight line and is known as a linear equation.

By madhuchaliyan on the 17th of January, 2013

Solve quadratic equations by factorising

Quadratic equations have the general form:

ax2 + bx + c = 0

When factorising a quadratic they are usually into a pair of brackets.

For example: x+ 5x + 6 = 0 (x + 2)(x + 3) = 0

This is useful, because once they are factorised, we can solve them easily (i.e. find out what x must be).

We have two numbers (each of the two brackets) which when multiplied together, make 0. You can make 0 by at least one of the brackets being zero (since any number multiplied by zero is zero! e.g. 2 x 0 = 0, 56 x 0 = 0, 0 x 3 x 320 = 0. )

So, whatever x is, each bracket must add up to 0 for the result to = 0.

For the first bracket, x must be -2, since (-2 + 2)(-2 + 3) = 0 x 1 = 0.

For the second bracket, x must be -3, since (-3 + 2)(-3 + 3) = -1 x 0 = 0.

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