Question

What are the exact solutions of x2 − 5x − 7 = 0?

Answer 1

@jim_thompson5910 , help please ?

Answer 2

are you familiar with the quadratic formula?

Answer 3

use \[D= (-b \pm \sqrt{b^2-4ac})/2a\]

Answer 4

If not, then you can use this to solve other (similar problems). So I recommend writing this into your notes

In this case,

a = 1

b = -5

c = -7


Plug them into the formula below and simplify

\[\Large x = \frac{-b\pm\sqrt{b^2-4ac}}{2a}\]

\[\Large x = \frac{-(-5)\pm\sqrt{(-5)^2-4(1)(-7)}}{2(1)}\]

\[\Large x = \frac{5\pm\sqrt{25-(-28)}}{2}\]

\[\Large x = \frac{5\pm\sqrt{53}}{2}\]

Answer 5

Does that help? Or are you stuck somewhere?

Answer 6

It helps, thankssssss ! Life saver

Answer 7

alright, I'm glad I could help out

Answer 8

Thanks

Answer 9

you're welcome