Question

(2a -3b) cube
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Answer 1

Step-by-step explanation:

(2a-3b)³ = (2a - 3b) [(2a)²+2a×3b +(3b)³]

=(2a-3b) [4a + 6ab + 9b³]

Answer 2

Answer:

Step-by-step explanation:

(2a−3b)3

Let us consider that, x= 2a  and y= 3b

So, the equation is,

(x−y)3

⇒x3−3x2y+ 3xy2−y3

⇒(2a)3−3.(2a)2.3b+ 3.2a.(3b)2−(3b)3          [Inputting  the values of x and y]

⇒8a3−3.4a2.3b+ 3.2a.9b2−27b3

⇒8a3−36a2b+ 54ab2−27b3

∴(2a−3b)3= 8a3−36a2b+ 54ab2−27b3