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How do you factorise and know if it is a difference of two squares ?

1. First you need to learn how to recognise the form: Difference of two square numbers . a 2 - 36 (a 2 is a square number and 36 is also a square number and you are getting the difference between them) To fa...
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Answered by Esther L. • Maths tutor
5143 Views

Finding Roots of Quadratic Equations

Finding Roots of Quadratic Equations What is a root to an equation? A root to an equation is a set of value(s) that satisfy the equation and when shown graphically they are the x values at which the function...
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Answered by Alexander G. • Maths tutor
22783 Views

What are the differences between decimal points and significant figures?

The total number of digits to the right of the point are known as ' decimal points ' whereas significant figures start from the first non-zero number. Note : As significant figures start from the first non-z...
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Answered by Niall L. • Maths tutor
84731 Views

How do I find the length of a side of a triangle using the cosine rule?

Suppose we have a triangle with 2 sides of length 4 and 5 (in any units), and the angle between those sides is 60 degrees. We want to find the length of the side opposite the 60 degree angle. Write the cosin...
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Answered by Angus H. • Maths tutor
5862 Views

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 clearer ...
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Answered by Bethany H. • Maths tutor
47705 Views