Question

Pls helppp :))

Solve for x by factoring

X^2+4x-21=0

There are multiple answers

Answer 1

`x=3,-7`

Explanation:

We can solve for x by using
`\frac{-b\pm\sqrt{b^(2) -4ac} }{2a}`

By applying this on the quadratic equation, we get:

`x=\frac{-4\pm\sqrt{4^(2)+84} }{2}`

Which simplifies to:

`x=(-4\pm10)/(2)`

`\therefore x=3,-7`