Factors of m2 – 4m – 21 ……………….. A) (m + 3)2 B) (m +

1.	Factors of m2 – 4m – 21 ……………….. A) (m + 3)2 B) (m + 7) (m – 31) C) (m – 7)2 D) (m – 7) (m + 3)
Answer» D) (m – 7) (m + 3) Correct option is (D) (m – 7) (m + 3) \(m^2–4m–21\) \(=m^2-7m+3m-21\) = m(m - 7) + 3(m - 7) = (m – 7) (m + 3)

Factors of m2 – 4m – 21 ……………….. A) (m + 3)2 B) (m + 7) (m – 31) C) (m – 7)2 D) (m – 7) (m + 3)

Answer»

D) (m – 7) (m + 3)

Correct option is (D) (m – 7) (m + 3)

\(m^2–4m–21\) \(=m^2-7m+3m-21\)

= m(m - 7) + 3(m - 7)

= (m – 7) (m + 3)