(a + b)3 – 3ab (a + b) = …………….. A) a3 + b3 B) a3 -b3 C

1.	(a + b)3 – 3ab (a + b) = …………….. A) a3 + b3 B) a3 -b3 C) a – b3 D) 3a-b
Answer» Correct option is A) a³ + b³ Correct option is (A) a³ + b³ \((a+b)^3–3ab\,(a+b)\) \(=a^3+b^3+3ab(a+b)-3ab(a+b)\) = \(a^3+b^3\)

(a + b)3 – 3ab (a + b) = …………….. A) a3 + b3 B) a3 -b3 C) a – b3 D) 3a-b

Answer»

Correct option is A) a³ + b³

Correct option is (A) a³ + b³

\((a+b)^3–3ab\,(a+b)\) \(=a^3+b^3+3ab(a+b)-3ab(a+b)\)

= \(a^3+b^3\)