Q. Find the zeros of the function f(x)=x2+7.8x+12.3. Round values to the nearest hundredth (if necessary).Answer: x=
Identify equation type: Identify the type of equation and the method to find its zeros.The given function is a quadratic equation of the form f(x)=ax2+bx+c. To find the zeros of the function, we can use the quadratic formula, which is x=2a−b±b2−4ac, where a, b, and c are the coefficients of the quadratic equation.
Apply quadratic formula: Apply the quadratic formula to the given function.For the function f(x)=x2+7.8x+12.3, the coefficients are a=1, b=7.8, and c=12.3. Plugging these values into the quadratic formula gives us:x=2⋅1−7.8±7.82−4⋅1⋅12.3
Calculate discriminant: Calculate the discriminant (the part under the square root in the quadratic formula).The discriminant is b2−4ac, so we calculate:7.82−4×1×12.3=60.84−49.2=11.64
Calculate square root: Calculate the square root of the discriminant. 11.64≈3.41
Calculate possible values: Calculate the two possible values for x using the quadratic formula.x=2−7.8±3.41This gives us two solutions:x1=2(−7.8+3.41)x2=2(−7.8−3.41)
Solve for x1 and x2: Solve for x1 and x2.x1=2(−7.8+3.41)≈−2.195x2=2(−7.8−3.41)≈−5.605
Round solutions: Round the solutions to the nearest hundredth. x1≈−2.20x2≈−5.61
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