Most liberal scholars contend that the NT relied partly on several quotes taken from the LXX/Septuagint. James White, Nestle & Aland, Doug Kutilek, Daniel Wallace, et al, all agree with this assertion.
I strongly disagree that the Septuagint was used by any of the NT apostles or Christ, and was taken from Origan’s 5 Column of the Hexapla in 245 AD, and there are numerous NT quotes that show that Christ quoted from a Hebrew OT, not Greek (Matt 7:12, 11:13, 22:40, 23:35, Luke 24:27,44*). However, I believe for those that do agree with the notion that the NT writers quoted the LXX are faced with 2 problems:
1. Does this mean that they believe the LXX to be inspired? Scholars emphatically claim that only the “originals” are inspired, but it is obvious that if the stories surrounding the LXX were true, and it was really a 4th century –2nd century BC translation concocted by Aristeas, then it clearly is not part of the original Hebrew, which means that for the NT writers to claim that all Scripture in the NT are authoritative that made OT quotes based on the LXX would have to necessarily claim inspiration for the LXX. Otherwise, the apostles and Christ Himself could be accused of calling something Scripture that was not given by inspiration of God.
2. The second problem this presents is that these ‘scholars’ emphatically claiming that only the originals are inspired, but not translations, are faced with a blatant contradiction. If the LXX was a translation from Hebrew to Greek, and quoted by the Apostles and Christ in the NT, not only must they hold the LXX to be inspired, but they must also abandon their argument that a translation can not be inspired because by default, if the LXX is inspired, then it naturally follows that since it is itself a translation, that translations can be inspired.
So either scholars must abandon their arguments against the KJV that translations can not be inspired, or they must admit that the LXX is not authoritative and was in fact NOT used by any of the NT writers, or quoted by Jesus.
*The LXX was not divided in the manner in which the Hebrew OT was with the divisions of the Law, Prophets and Writings. These quotes from Christ show clearly that He never quoted from the Septuagint, but from the Hebrew. In Matthew 23:35, Christ makes reference to the Pharisees being guilty of the blood of Abel to Zacharias. In a Hebrew Bible, 2 Chronicles is the last book (where Zacharias is located. 2 Chronicles 24). Thus Christ is quoting this story in the order given in a Hebrew Bible, not a Septuagint.