Identify coefficients: Identify the coefficients a, b, and c from the quadratic equation7w2+5w+8=0 by comparing it to the standard form ax2+bx+c=0. Here, a=7, b=5, and c=8.
Recall formula: Recall the formula for the discriminant of a quadratic equation, which is D=b2−4ac.
Substitute values: Substitute the identified values into the discriminant formula: D=(5)2−4×7×8.
Calculate discriminant: Calculate the discriminant: D=25−4×7×8.
Perform multiplication: Perform the multiplication and subtraction to find the value of the discriminant: D=25−224.
Complete calculation: Complete the calculation to get the final value of the discriminant: D=−199.