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Maths

GCSE

How to use trigonometry to find angles or lengths

Before starting any calculations it makes sense for the new practitioner to use the handy "soh-cah-toa" rule which means that you use:

- sine with the opposite and hypotenuse si...

Answered by Bradley L. • Maths tutor

6889 Views

How do you solve an equation with brackets?

If you are given an equation with brackets, one way to solve it is to multiply out the brackets. Follow the example below:

Solve the equation: 2(a + 5) = 16

Answered by Emma G. • Maths tutor

40905 Views

Pythagoras' Theorem

Pythagoras was a Greek philosopher who discovered that in a right angled triangle (triangle with one angle 90 degrees) the hypotenuse squared , c², ...

Answered by Katie C. • Maths tutor

5298 Views

Probability: "Sock Drawer" style questions.

Here is a genuine probability question I once tackled:

“In your sock drawer there are 6 blue socks, 2 red socks and 2 white socks, distributed so that the probability of ...

Answered by William H. • Maths tutor

72656 Views

How do signs change in an inequality?

Normal manipulation of inequalities does not affect the direction of the inequality such as:
addition
subtraction
multiplication or division by a positive number,

...

Answered by Oscar Z. • Maths tutor

10549 Views