Q. Use the Quadratic Formula to solve the quadratic below:x2−5x+9=0
Identify coefficients: Identify the coefficients a, b, and c in the quadratic equationx2−5x+9=0. By comparing x2−5x+9 with the standard quadratic form ax2+bx+c, we find that a=1, b=−5, and c=9.
Apply Quadratic Formula: Apply the Quadratic Formula to find the roots of the equation.The Quadratic Formula is given by (−b±b2−4ac)/(2a). We will substitute a=1, b=−5, and c=9 into the formula.
Substitute values: Substitute the values of a, b, and c into the Quadratic Formula.(−(−5)±(−5)2−4⋅1⋅9)/(2⋅1) simplifies to (5±25−36)/2.
Simplify square root: Simplify the expression under the square root. 25−36=−11, so the expression becomes (5±−11)/2.
Complex roots: Since the value under the square root is negative, we will have complex roots. We can express −11 as 11×−1, where −1 is the imaginary unit i. The expression becomes (5±11i)/2.
Divide by 2: Simplify the expression by dividing both terms by 2. (25)±(211)i is the simplified form of the roots in a+bi form.
Write in a+bi form: Write the roots in the simplest a+bi form.The roots are 25+(211)i and 25−(211)i.
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