need help fast what are all the solution to this problem

[SOLVED] need help fast what are all the solution to this problem
See Answers (2)

Accepted Answer

x² - 25 = 0The left side is the difference of 2 squares,so we know right away, without any uncertaintyor sweat, that it can be written as                   (x + 5) (x - 5) ,and we know that it's equal to zero when either factor is zero.Now let's look at the choices:A.  X = -1  Not a chance.B.  X = -3  Also no.C.  X = -5  Yes that's good; that would make the first factor zero. D.  X = 5    Yes that's good too; it would make the second factor zero.E.  X = 3    Not true.  Don't know how they came up with it.F.  X = 1    Equally not true.

Suggested Answer

[tex] x^{2} - 25 = 0 \\ x^{2} = 0 + 25 \\ x^{2} = 25 \\ x = \pm \sqrt{25} \\ \boxed{x = \pm 5}[/tex]correct alternatives : C , D