Can anyone answer this question The roots of the quadratic equation z² + az + b = 0 are -7 + 2i and -7 - 2i. What is a+b

For how answer my question this will be the last question can you answer in math subject

Clara schumann is buying bagels for her coworkers, she buys a dozen bagels priced at $5.49 a dozen. the bakery's cost for making the bagels is $2.25 per dozen. what is the markup rate based on selling price on a dozen bagels?

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 4x^2 - 19x- 5