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4.6 Practice B (evens): Write the expression as a complex number in standard form. 1.) Algebra II 4.8: Quadratic Formula Quadratic Formula The quadratic formula is used to solve any quadratic equation. Quadratic then Formula: If ax2 + bx + c = 0, Discriminant The The discriminant = b2 – 4ac value of the discriminant tells you how many solutions the quadratic equation has. 0 1 real solution. positive number 2 real solutions. negative number 2 imaginary solutions. Find the discriminant and determine the number of solutions. 1.) x – 8x + 16 = 0 2 2 2.) 5x + 20x = -21 Use the Quadratic Formula to find the solutions to the equation. 1.) x2 – 4x – 5 = 0 Use the Quadratic Formula to find the solutions to the equation. 2.) 3 – 8v – 5v = 2v 2 Use the Quadratic Formula to find the solutions to the equation. 3.) 4x2 + 3 = x2 – 7x