Question

Using the Quadratic Formula, which of the following is the solution to the quadratic equation x2 + 2x - 3 = 0?

Answer 1

Answer: x=1 or x=-3

Explanation:

Quadratic formula is
`-b+-\sqrt{b^(2)-4ac } /2`

a=1 b=2 c=-3

Substitute

`(-2+-\sqrt{2^(2)-4(1)(-3) }) /2\\(-2+-√(4+12)) /12\\(-2+-√(16)) /2\\(-2+-4) /2\\x=(-2+4)/(2) \\x=(-2-4)/(2) \\\\\\Simplify\\x=(2)/(2) \\\\x=(-6)/(2) \\\\Simplify\\x=1\\x=-3`