Question

Solve using the quadratic formula. Show all work. Write each solution in simplest form. No decimals.

Answer 1

Answer A

Explanation:

The coefficients of the x terms are 1, 4 and 7. Thus, the discriminant, b^2 - 4ac, is 16 - 4(1)(7) = -12 = -3·4. Because the discriminant is negative we know that there are two unequal, complex roots.

-4 ± i√3√4 -2 ±i√3

The roots are x = --------------------- =

2

This is Answer A.