Question 4 - A-Level Maths

Exam Board	Edexcel
Module	Paper 2 (Paper 2)
Year	2020
Session	October
Topic	Binomial Theorem (positive integer n)
Type	Single coefficient given directly

In the binomial expansion of
\(( a + 2 x ) ^ { 7 } \quad\) where \(a\) is a constant
the coefficient of \(x ^ { 4 }\) is 15120
Find the value of \(a\).