Once the delegates to the constitutional convention agreed on the constitution, what was required for it to become official?

It was necessary that three quarters of the states ratified the document, only in this way the constitution would be valid.

Explanation:

In late July 1787, the Philadelphia Convention appointed a committee to draft a document based on the agreements reached for the constitution. After another month of discussion and refinement, a second committee, the Style and Arrangement Committee, drafted the final version of the constitution, which was tabled for signature on September 17.

Not all delegates were satisfied with the results; some retired before the ceremony, and three of them remained but refused to sign: Edmund Randolph and George Mason of Virginia, and Elbridge Gerry of Massachusetts, both demanded a Bill of Rights to support the Constitution. The Bill of Rights has finally been drafted and is considered as the final compromise of the Convention. Of the 39 who signed, probably no one was completely satisfied, but there were enough signatures to ratify the constitution.

the answer is false.