Factor 21x^2 + 2x - 55

[From: ] [author: ] [Date: 11-09-20] [Hit: ]

Help....please :)

( 1 - k )(1 + k ) = 21*-55
1 - k^2 = - 1155
1156 = k^2
34 = k

- 33 and 35

21x^2 - 33x + 35x - 55
= 3x(7x - 11) + 5(7x - 11)
= (3x + 5)(7x - 11)

keywords: 55,Factor,21,Factor 21x^2 + 2x - 55