Q. What is the discriminant of the quadratic equation 5x2−8x+9=0 ?−244244116−116
Identify coefficients and equation: The discriminant of a quadratic equation ax2+bx+c=0 is given by the formula D=b2−4ac. We need to identify the coefficients a, b, and c from the given equation and substitute them into the formula to find the discriminant.
Given quadratic equation: The given quadratic equation is 5x2−8x+9=0. Here, the coefficient a is 5, the coefficient b is −8, and the coefficient c is 9. We will use these values in the discriminant formula.
Substitute values into formula: Substitute a=5, b=−8, and c=9 into the discriminant formula D=b2−4ac. This gives us D=(−8)2−4(5)(9).
Calculate the discriminant: Calculate the discriminant using the values from the previous step: D=64−4(5)(9). First, calculate the square of −8, which is 64, and then calculate 4×5×9, which is 180.
Subtract to find the value: Subtract 180 from 64 to find the discriminant: D=64−180.
Subtract to find the value: Subtract 180 from 64 to find the discriminant: D=64−180.Perform the subtraction to get the final value of the discriminant: D=−116.