Q. For the following quadratic equation, find the discriminant.−x2+4x+11=8x−1Answer:
Rearrange equation: Bring all terms to one side of the equation to get it into standard quadratic form ax2+bx+c=0.We start by subtracting 8x and adding 1 to both sides of the equation.−x2+4x+11−8x+1=8x−1−8x+1This simplifies to:−x2−4x+12=0
Identify coefficients: Identify the coefficients a, b, and c in the standard quadratic form.From the equation −x2−4x+12=0, we can see that:a=−1, b=−4, and c=12
Calculate discriminant: Use the discriminant formula to find the discriminant of the quadratic equation.The discriminant D is given by D=b2−4ac.Plugging in the values of a, b, and c, we get:D=(−4)2−4(−1)(12)
Calculate discriminant: Use the discriminant formula to find the discriminant of the quadratic equation.The discriminant D is given by D=b2−4ac.Plugging in the values of a, b, and c, we get:D=(−4)2−4(−1)(12)Calculate the discriminant.D=16−4(−1)(12)D=16+48D=64
More problems from Solve exponential equations by rewriting the base