Question

Factorise
15 a^3 b - 35ab^3​

Answer 1

15 a^3 b - 35ab^3

taking common

5ab(3a²-7b²)

Answer 2

`\huge \boxed{ \boxed{ \red{3ab(5 {a}^(2) - 7 {b}^(2) )}}}`

Explanation:

to understand this

you need to know about:

• factoring

tips and formulas:

1. therefore are many ways to factor. In this question to factor we just need to figure out GCF of the following expression
2. factor out the GCF

given:

• 15a³b-35ab³

let's solve:

1. rewrite 15a³b as 3×5×a×a×a×b
2. rewrite -35ab³ as -1×7×5×a×b×b×b
3. therefore the GCF of the expression is 5ab
4. let's factor out 5ab:5ab(3a²-7b²)

and

we are done