Question

Kendrick is using the quadratic formula to solve the equation . His substitution is shown.

Quadratic formula: x =

x =

Which statement best describes Kendrick’s work?



The expression under the radical is correct as written.
The expression under the radical should be –42 – 4(1).
The expression under the radical should be –42 – 4(1)(0).
The expression under the radical should be (–4)2 – 4(1)(0).