Solve the equation using the quadratic formula.
x^2+ 11x + 9 = 0
The solution set is

Solve the equation using the quadratic formula ⇨ x² + 11x + 9 = 0

All equations of the form can be solved using the quadratic formula: . The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.

This equation is in standard form: ax² + bx + c = 0. Substitute 1 for a, 11 for b and 9 for c in the quadratic formula .

Square 11.

Multiply -4 times 9.

Add 121 to -36.

Now solve the equation when ± is plus. Add -11 to √85.

Now solve the equation when ± is minus. Subtract √85 from -11.

The equation is now solved. The solution set is :-

hope it helps

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