Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth. x^2+3=-4x

a. 1,3

b. - 1, - 3

c. 1, - 3

Add 4x to both sides

x^2+4x+3=0

we don't need quadratic formula, just factor

what 2 numbers multiply to get 3 and add to get 4

3 and 1

(x+3) (x+1) = 0

set to zero

x+3=0

x=-3

x+1=0

x=-1

x=-11,-3

B is answer

The general form of the quadratic equation is,

ax² + bx + c = 0

The general form of the equation given above is,

x² + 4x + 3 = 0

Using quadratic formula for solving the values of x,

x = ((-b) + / - sqrt (b² - 4ac)) / 2a

Substituting,

x = ((-4) + sqrt (4² - 4 (1) (3)) / 2 (1) = - 1

x = ((-4) - sqrt (4² - 4 (1) (3)) / 2 (1) = - 3

Thus, the values of x are - 1 and - 3. The answer is letter B.