I need to know the answer

Question

asked Aug 13, 2020 18.5k views

1 Answer

Josefina · Answer 1 · 2020-08-18T10:55:36+0000

Answer:

A

Explanation:

That's the formula for the solution of a quadratic equation, like this:

$a {x}^(2) + bx + c = 0$

The formula is:

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

In your case:

$a = 7 \\ b = - 5 \\ c = - 2$

The only answer that has c = -2 is the first one, A.

If you move the 5 to the left-hand side, it becomes -5 and with the +3 gives a -2.