The correct quadratic formula to solve
is
. The accurate representation is given in option B.
The correct quadratic formula for solving
is represented as follows:
![\[ x = (-b \pm √(b^2 - 4ac))/(2a) \]](https://img.qammunity.org/2022/formulas/mathematics/middle-school/dykbynok2shwklm89mcx36t77uhe9mijt1.png)
Comparing this with the provided options:
A. Incorrect. The term inside the square root is incorrect; it should be
.
B. Correct. The quadratic formula is used correctly with the correct values for a, b, and c.
C. Incorrect. The term inside the square root is incorrect; it should be
.
D. Incorrect. The term inside the square root is incorrect; it should be
.
Therefore, the correct answer is B:
![\[ x = (1 \pm √((-1)^2 - 4(7)(9)))/(2(7)) \]](https://img.qammunity.org/2022/formulas/mathematics/high-school/ruz28crwn90apupr66upya5zy1bmnlmbq7.png)