a(a + 1) = 6 then a = ……………….. A) 2 B) – 3C) A&B D) N

1.	a(a + 1) = 6 then a = ……………….. A) 2 B) – 3C) A&B D) None
Answer» Correct option is C) A&B Correct option is (C) A&B a(a + 1) = 6 \(\Rightarrow\) \(a^2+a-6=0\) \(\Rightarrow\) \(a^2+3a-2a-6=0\) \(\Rightarrow\) a(a+3) - 2(a+3) = 0 \(\Rightarrow\) (a-2) (a+3) = 0 \(\Rightarrow\) a - 2 = 0 or a+3 = 0 \(\Rightarrow\) a = 2 or a = -3

a(a + 1) = 6 then a = ……………….. A) 2 B) – 3C) A&B D) None

Answer»

Correct option is C) A&B

Correct option is (C) A&B

a(a + 1) = 6 \(\Rightarrow\) \(a^2+a-6=0\)

\(\Rightarrow\) \(a^2+3a-2a-6=0\)

\(\Rightarrow\) a(a+3) - 2(a+3) = 0

\(\Rightarrow\) (a-2) (a+3) = 0

\(\Rightarrow\) a - 2 = 0 or a+3 = 0

\(\Rightarrow\) a = 2 or a = -3