Question

Solve the following quadratic function by using the quadratic formula: x^2 + 2x - 1 = 2 *

Answer 1

Answer:

x = 1 or x = -3

Step-by-step explanation:

$ax^{2}$ + bx + c = 0

x = $\frac{-b±\sqrt{b^{2}-4ac } }{2a\\}$

as $x^{2}$ + 2x - 1 = 2 ⇔  $x^{2}$ + 2x - 3 = 0, its solution is

x = $\frac{-2±\sqrt{2^{2}-4 *1*(-3)} }{2*1}$

=  $\frac{-2±\sqrt{4+12} }{2}$ =  $\frac{-2±\sqrt{16} }{2}$ =  $\frac{-2±\ 4 }{2}$

therefore, x = 1 or x = -3

hope this helps! :D

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