Q. For the following quadratic equation, find the discriminant.−4x2+10x−18=−3x2+7Answer:
Bring to Standard Form: First, we need to bring the quadratic equation to standard form, which is ax2+bx+c=0. To do this, we will move all terms to one side of the equation by adding 3x2 to both sides and subtracting 7 from both sides.Calculation: −4x2+10x−18+3x2−7=0
Simplify the Equation: Now, we simplify the equation by combining like terms.Calculation: (−4x2+3x2)+10x+(−18−7)=0This simplifies to: −x2+10x−25=0
Identify Coefficients: Next, we identify the coefficients a, b, and c from the standard form of the quadratic equation, where a is the coefficient of x2, b is the coefficient of x, and c is the constant term.In our equation, a=−1, b=10, and b0.
Calculate Discriminant: The discriminant of a quadratic equation ax2+bx+c=0 is given by the formula D=b2−4ac. We will use the values of a, b, and c we found in the previous step to calculate the discriminant.Calculation: D=(10)2−4(−1)(−25)
Find Discriminant: Now, we perform the calculation to find the discriminant.Calculation: D=100−4×1×25D=100−100D=0