Question

The binomial expansion 625x⁴ – 7 500x³ + 33 750x² – 67 500x + 50 625 can be expressed as (ax + b)⁴. What is the value of b?

-15
-5
5
15​

Answer 1

Answer:

-15  as  

Step-by-step explanation:

$\sqrt[4]{50625}=15$ or -15

again in the given expansion each alternate term have -ve sign

i,e the odd power of b have - sign

so b should be -15