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Maths
GCSE

How do you substitute a number into an algebraic expression?

To substitute a number into an algebraic expression, all you need to do is re-write the expression in exactly the same way, except replacing the variable (letter) with the number. It always makes it cl...

Answered by Bethany H. Maths tutor
38514 Views

How can I know whether to multiply or add probabilities?

We can only add probabilities when the events are alternatives. For example, let's say we want to calculate the probability that we achieve an A or a B or a C in a giv...

Answered by Nathan O. Maths tutor
70815 Views

How do I know how many solutions a quadratic equation has?

A quadratic equation is an equation that looks like:

x2 + 4x - 2 = 0.

The general form of this is written as ax2 + bx + c = 0, where a, b and c are all...

Answered by Nathan C. Maths tutor
80359 Views

How to factorise

For example: 5x +25

In order to factorise we need to find a common factor for both '5x' and '25'. This factor gets taken outside of the brackets.

For this example the common ...

Answered by Emily C. Maths tutor
12030 Views

How do I factorise quadratic equations?

x2+x-6=y

Is the equation we will use to demonstrate how to factorise quadratics.

The first step involves using the basic shape of all quadratic f...

Answered by Joshua O. Maths tutor
4205 Views

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