Question 19 Answer and Explanation _ACT December 2022 Form F07 Math Section

19. On her algebra exam, Hannah had to solve the equation x² + 3x - 8 = 0 for x. Confident that the quadratic formula was the correct method to solve this equation, she started her solution with the equation below. What error, if any, did Hannah make in setting up the equation?

A. Hannah should have used -8 instead of 8 in the term -4(1)(8) under the radical.

B. Hannah should have used -3 instead of 32 under the radical.

C. Hannah should have used -2 instead of 2 in the denominator.

D. Hannah should have used 3 instead of -3 in the numerator.

E. Hannah did not make an error.

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

The root sign should be b²-4ac, c should be -8, so A is correct