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D=72−4(2)(-9)cap D equals 7 squared minus 4 open paren 2 close paren open paren negative 9 close paren D=49+72=121cap D equals 49 plus 72 equals 121 , there are two real roots. Note that Calculate the roots using

For further practice, you can find full variants and video solutions on resources like Infourok or YouTube . D=72−4(2)(-9)cap D equals 7 squared minus 4 open

Simplify expressions containing square roots or rationalize the denominator. Full Quadratic Equations Solve using the formula Sample Problem Walkthrough Problem : Solve the quadratic equation 1. Identify Coefficients Identify the values for from the standard form D=72−4(2)(-9)cap D equals 7 squared minus 4 open