Question

expand the equation (4a+5a)³​

Answer 1

Answer:

(4a+5a)³ = 725a³

Explanation:

(4a+5a)³ is in the form of (a+b)³

(a+b)³ = a³+3a²b+3ab²+b³

⇒(4a+5a)³ = (4a)³+3(4a)²(5a)+3(4a)(5a)²+(5a)³

⇒(4a+5a)³ = 60a³+240a³+300a³+125a³

⇒(4a+5a)³ = 725a³