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How do I solve a quadratic equation by factorising?

A quadratic equation is one that includes x²as 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...

Answered by Shannon G. • Maths tutor

4904 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
6718 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
5059 Views

How do I use Pythagorus' Theorum?
Pythagorus' Theorum is used to calculate the lengths of the sides of a right angled triange, and is written mathematically as follows:

a² + b² = c²
NP
Answered by Narissa P. • Maths tutor
6149 Views
What can I say about the roots of a quadratic equation without actually calculating them?
If a quadratic equation is of the form ax²+bx+c, calculate D (Discriminant) whose value is b²-4ac.

If the value of D is negative, the equation has imaginary roots.<...
SS
Answered by Swapnil S. • Maths tutor
4564 Views
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Top answers

How do I solve a quadratic equation by factorising?

How do I expand brackets by multiplication?

What is the cosine rule?

How do I use Pythagorus' Theorum?

What can I say about the roots of a quadratic equation without actually calculating them?

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