Question

For what value of k, we have 7x² - 5x + k = -4, given that x = -2,

• A. -42
• B. 42
• C. -22
• D. 22

Answer 1

The correct option is A

-42

Substituting the value of x in the given expression, we get

7 x (-2)² -5 x (-2) + k = -4

28 + 10 + k = -4

38 + k = -4

Thus, k = -42