-xsquared-15x=-54?

Question

please tell me the answer! =]

Answer 1

-x^2 - 15x= -54

- x^2 -15x +54 = 0                

we have the formula is :  [ - b -+square root of { b^2- 4(a)(c) } ]  / 2 ( a ).

a= -1 ;  b= -15 ;  c = 54.

now put the numbers into the formula, then calculate by yourself. ok ?

x1= -18  ; x2 = 3

hey take this you might see the formula :

http://www.purplemath.com/modules/quadfr...

Answer 2

x = 3