What basic algebraic technique is used to derive the quadratic​ formula? graphing

finding the greatest common factor

writing the prime factorization of a number

completing the square

Step-by-step explanation:

Completing the square

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right