Q. What is the discriminant of the quadratic equation 7x2−7x−8=0 ?273−175175−273
Identify coefficients: Identify the coefficients of the quadratic equation.The general form of a quadratic equation is ax2+bx+c=0. For the given equation 7x2−7x−8=0, the coefficients are:a = 7 (coefficient of x2)b = −7 (coefficient of x)c = −8 (constant term)
Recall discriminant formula: Recall the formula for the discriminant of a quadratic equation. The discriminant of a quadratic equation ax2+bx+c=0 is given by the formula D=b2−4ac.
Substitute into formula: Substitute the identified coefficients into the discriminant formula.Using the coefficients from Step 1, we substitute them into the discriminant formula:D=(−7)2−4(7)(−8)
Calculate discriminant: Calculate the discriminant.Now, we perform the calculations:D=49−4(7)(−8)D=49+224D=273