Question

Joline is solving the equation 0 = x2 – 5x – 4 using the quadratic formula. Which value is the negative real number solution to her quadratic equation? Round to the nearest tenth if necessary. Quadratic formula: –5.7 –4 –1 –0.7

Answer 1

-5.7

Explanation:

OUR EQUATION IS A QUADRATIC EQUATION

Let Δ be our dicriminant :

• a= 1
• b= 5
• c= -4
• Δ= 5²-4*1*(-4) =25 +16 =41≥0
• so we have two solutions x and y
• x= (-5-√41)/2 = -5.7