Solve using the quadratic formula.8r2+8r+2=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.8r2+8r+2=0Write your answers as integers, proper or improper fractions in simplest form, or decimals rounded to the nearest hundredth.r=_____ or r=_____
Identify coefficients: Identify the coefficients of the quadratic equation8r2+8r+2=0. The standard form of a quadratic equation is ax2+bx+c=0, where a, b, and c are coefficients. Here, a=8, b=8, and c=2.
Recall quadratic formula: Recall the quadratic formula, which is r=2a−b±b2−4ac. We will use this formula to find the values of r.
Substitute coefficients: Substitute the coefficients a, b, and c into the quadratic formula. This gives us r=2(8)−(8)±(8)2−4(8)(2).
Simplify square root: Simplify the expression inside the square root: (8)2−4(8)(2)=64−64=0.
Simplify quadratic formula: Since the discriminant (the value inside the square root) is 0, the square root of 0 is 0. Therefore, the quadratic formula simplifies to r=(−8±0)/16.
Find value of r: Simplify the expression to find the value of r: r=(−8)/16=−21.
Unique solution: Since the discriminant was 0, there is only one unique solution for r. Therefore, r=−21 is the only solution.
More problems from Solve a quadratic equation using the quadratic formula