How to factorise trinomials
Answers
Answer:
Factorising trinomials
A trinomial expression takes the form:
To factorise a trinomial expression, put it back into a pair of brackets.
To find the terms that go in each bracket, look for a pair of numbers which multiply to give the last number and add together to give the middle number.
Answer:
Factorising trinomials
A trinomial expression takes the form:
a{x^2} + bx + c
To factorise a trinomial expression, put it back into a pair of brackets.
To find the terms that go in each bracket, look for a pair of numbers which multiply to give the last number and add together to give the middle number.
Example
Factorise the following trinomial expression.
{a^2} + 7a + 12
Firstly find the numbers that go into each bracket.
Look for a pair of numbers which multiply to give the last number and add to give the middle number.
For this expression, we're looking for two numbers which multiply to give 12 and add to give 7.
Step-by-step explanation:
Therefore the answer is: (a + 3)(a + 4)
When factorising expressions, always check by multiplying out the brackets again.
Now try the example questions below.
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