Question

Which of the binomials below is a factor if this trinomial?

x^2 - 3x - 4

A. x + 4

B. x + 8

C. x^2 + 4

D. x - 4

Answer 1

D. x - 4

Explanation:

x² - 3x - 4 = ( x - 4 )( x + 1 )

main formula: x² + ( a + b )x + ab = ( x + a )( x + b )