what is x if x^2+18x+45=0?

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2007-11-15 03:31:03 · 4 answers · asked by vjohnson13 1 in Science & Mathematics ➔ Mathematics

(x + 15) (x + 3) = 0
x = - 15 , x = - 3

2007-11-19 00:01:26 · answer #1 · answered by Como 7 · 0⤊ 0⤋

x^2+18x +45=0

x^2 + 15x + 3x +45=0
x ( x+15) + 3( x+15)=0. (x+3) ( x+15)=0.
x= -3 , x= -15.

2007-11-15 05:49:43 · answer #2 · answered by Sasi Kumar 4 · 0⤊ 0⤋

Use x = -b + or - the square root of 2a - 4c all over 2a.

a=1
b=18
c=45

x= (-18 + 12)/2 or (-18 - 12)2

x= -3 or -15

2007-11-15 03:39:12 · answer #3 · answered by mmlxxviii 2 · 0⤊ 0⤋

(x+3)(x+15)=0
x=-3 or-15

2007-11-15 03:34:01 · answer #4 · answered by someone else 7 · 0⤊ 0⤋