help?
solve by compleating the square
x²+10x=18
use the quadratic formula to solve
x²+3=-4x

Question

help?
solve by compleating the square
x²+10x=18
use the quadratic formula to solve
x²+3=-4x

anonymous · Answer

$$x^2+10z=18$$
$$(x+5)^2=18+25=43$$
$$x+5=\pm\sqrt{43}$$
$$x=-5\pm\sqrt{43}$$

anonymous · Answer

That isnt an option on my paper. are you sure?

anonymous · Answer

pretty sure, unless i made an arithmetic mistake
$18+25=43$ right?

anonymous · Answer

there shouldn't b a z in the beginning iif that changes anything...

directrix · Answer

@JaneDoe100 

Have you done this problem yet?

use the quadratic formula to solve
x²+3=-4x

directrix · Answer

@JaneDoe100  The solutions of @satellite73 are correct. Are your options approximations? Or, in some other way?

anonymous · Answer

The options are 11.56 and 1.56 all i need 2 know is if one of them is negitive

anonymous · Answer

and we havent done that problem

anonymous · Answer

ah use a calculator then, to get $-5+\sqrt{43}$ and $-5-\sqrt{43}$

anonymous · Answer

ok thanks! its -11.56 and +1.56 can you help me with the other one?

anonymous · Answer

@satellite73 ?