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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 1. Multiply out the brackets and remember that eve...
EG
Answered by Emma G. Maths tutor
42486 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 , c 2 , was equal to the sum of the other sides squared, a and b....
KC
Answered by Katie C. Maths tutor
6185 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 picking each is equal. Without looki...
WH
Answered by William H. Maths tutor
77812 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, The direction of the inequality will change ...
OZ
Answered by Oscar Z. Maths tutor
12488 Views

When do I use a cosine rule over a sine rule?

Both the sine and the consine rule applies to any triangle, you do not necessary need a right angle! You can usually use the cosine rule when you are given two sides and the included angle (SAS) or when you ...
JF
Answered by Jessica F. Maths tutor
128820 Views