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Maths
GCSE

How do I solve a quadratic equation by factorising?

 A quadratic equation is one that includes xas the highest power of x. Factorising is achieved in 3 steps. Let’s consider the example x2-3x-3=11) Put the equation into the form...

SG
Answered by Shannon G. Maths tutor
4536 Views

How do I expand brackets by multiplication?

It's worth remembering FOIL: First, Outside, Inside, Last.Say we have the following:(a+b)(c+d), where a,b,c and d are positive integers.Using FOIL, we have: (First) +...

LD
Answered by Liam D. Maths tutor
6299 Views

What is the cosine rule?

What is it?The cosine rule is a tool to find the size of an angle or the length of a side in a triangle.When to use it?- When we are given 2 sides and an angle- When we a...

NG
Answered by Naomi G. Maths tutor
4652 Views

How do I use Pythagorus' Theorum?

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