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The quadratic formula is the formula that solves any quadratic equation. So, keeping things general, let's begin with a completely general quadratic equation:

ax²+bx+c=0
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Firstly put the equation into the the form (x+a)(x+b) this will make things easier later on.

Therefore, an equation such as (x+1)² would become (x+1)(x+1)

Next expand the br...

Any geometric series is defined by an initial term a, and a common ratio b. This means that we start with a and multiply by b to get eac...

Standard deviation is the spread of data around the mean value. It is useful for evaluating the spread of a selection of data, and is used to compare multiple ...

Remember the rule for integrating is that x^n integrates to xⁿ⁺¹/(n+1). Here, n = 2 so n+1 = 3. Therefore the integral will be (x³)/3. Remember that as the integral has is indefi...