since the 1st and last are perfect squares, look for
(3x+7)^2 = 9x^2+42x+49
Factor completely 9x^2 + 42x + 49.
A. (3x + 7)(3x − 7)
B. (9x − 7)(9x − 7)
C. (3x + 7)(3x + 7)
D. (9x + 7)(9x + 7)
HELP PLEASE DON'T UNDERSTAND
4 answers
A. OR C. ?
HUH? I told you which one. See any minus signs anywhere?
oh thank you Steve and monalisa