Factorise the Expression: Finding Common Factors in 20ab-4ac

Question

Factorise:

$20ab-4ac$

Video Solution

Solution Steps

00:00 Find a common factor

00:04 Factor 20 into factors 4 and 5

00:13 Mark the common factors

00:22 Take out the common factors from the parentheses

00:33 And this is the solution to the question

Step-by-Step Solution

We first break down the coefficient of 20 into a multiplication exercise. That will help us to simplify the calculation : $5\times4\times a\times b-4\times a\times c$

We then extract 4a as a common factor: $4a(5\times b-c)=4a(5b-c)$

Answer

$4a(5b-c)$

Related Subjects

Factorization: Common factor extraction Algebraic Method

Question Types

Factorization - Common Factor: Applying the formula