Q. For the following quadratic equation, find the discriminant.−3x2−18x−72=−2x2Answer:
Simplify Quadratic Equation: First, we need to simplify the quadratic equation by moving all terms to one side to get it into standard form ax2+bx+c=0. −3x2−18x−72=−2x2 Add 2x2 to both sides to combine like terms. −3x2+2x2−18x−72=0
Combine Like Terms: Now, we simplify the equation further by combining the x2 terms.(−3x2+2x2)−18x−72=0−1x2−18x−72=0
Standard Form: We now have the quadratic equation in standard form, which is:−1x2−18x−72=0To find the discriminant of a quadratic equation in the form ax2+bx+c=0, we use the formula b2−4ac.
Identify Coefficients: Identify the coefficients a, b, and c from the equation −1x2−18x−72=0.a=−1, b=−18, c=−72
Substitute Values: Substitute the values of a, b, and c into the discriminant formula.Discriminant=b2−4acDiscriminant=(−18)2−4(−1)(−72)
Calculate Discriminant: Calculate the discriminant.Discriminant = 324−4(1)(72)Discriminant = 324−288
Final Result: Finish the calculation to find the value of the discriminant.Discriminant = 324−288Discriminant = 36
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