Solve using the quadratic formula.r2−3r−7=0Write your answers as integers, proper or improper fractions in simplest form, or decimals rounded to the nearest hundredth.r=_____ or r=_____
Q. Solve using the quadratic formula.r2−3r−7=0Write your answers as integers, proper or improper fractions in simplest form, or decimals rounded to the nearest hundredth.r=_____ or r=_____
Quadratic Formula: The quadratic formula is given by r=2a−b±b2−4ac, where a, b, and c are the coefficients from the quadratic equationar2+br+c=0. In this case, a=1, b=−3, and c=−7.
Calculate Discriminant: First, calculate the discriminant, which is the part under the square root in the quadratic formula: b2−4ac. Here, it is (−3)2−4(1)(−7).
Discriminant Calculation: Perform the calculation: 9−(−28)=9+28=37. The discriminant is 37.
Insert Values into Formula: Now, insert the values of a, b, and the discriminant into the quadratic formula: r=2⋅1−(−3)±37.
Simplify Equation: Simplify the equation: r=23±37.
Calculate First Solution: Since the discriminant is positive, there will be two real solutions. Calculate the first solution using the plus sign: r=23+37.
Calculate First Solution Value: Calculate the value of r to the nearest hundredth: r≈(3+6.08)/2≈9.08/2≈4.54.
Calculate Second Solution: Calculate the second solution using the minus sign: r=23−37.
Calculate Second Solution Value: Calculate the value of r to the nearest hundredth: r≈(3−6.08)/2≈−3.08/2≈−1.54.
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