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Multiple Choice
Find the solution(s) using the quadratic formula.
A
x=21
B
x=−21
C
x=1,x=21
D
x=1,x=−21
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1
Identify the coefficients from the quadratic equation \$4x^2 - 4x + 1 = 0\(. Here, \)a = 4\(, \)b = -4\(, and \)c = 1$.
Recall the quadratic formula: \(x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\), which is used to find the roots of any quadratic equation.
Calculate the discriminant \(\Delta = b^2 - 4ac\) by substituting the values: \(\Delta = (-4)^2 - 4 \times 4 \times 1\).
Evaluate the square root of the discriminant \(\sqrt{\Delta}\) and then substitute all values back into the quadratic formula to get the two possible solutions for \(x\).
Simplify the expressions for both \(x = \frac{-b + \sqrt{\Delta}}{2a}\) and \(x = \frac{-b - \sqrt{\Delta}}{2a}\) to find the exact roots of the equation.