You mean find solutions for x when 2x^2+12x+18=0.
First we can divide thru by 2 just to make it simpler.
x^2+6x+9=0 , then factor and get
(x+3)^2=0
so x=3.
2006-11-10 00:06:18
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answer #1
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answered by albert 5
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6x - 3y = 21 2x + 2y = 22 6x - 3y = 21 -3y = 21 - 6x y = 21/-3 - 6x/-3 y = -7 + 2x y = 2x - 7 2x + 2y = 22 2x + 2(2x - 7) = 22 2x + 4x - 14 = 22 6x - 14 = 22 6x = 36 x = 6 6x - 3y = 21 6(6) - 3y = 21 36 = 3y + 21 36 - 21 = 3y 15 = 3y 5 = y y = 5 verify x = 6 y = 5 6x - 3y = 21 6(6) - 3(5) = 21 36 - 15 = 21 21 = 21 The identity shows that the values x = 6 and y = 5 are the superb option for the above equation. 2x + 2y = 22 2(6) + 2(5) = 22 12 + 10 = 22 22 = 22 The identity shows that the values x = 6 and y = 5 are the superb option for the above equation.
2016-12-28 17:52:53
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answer #2
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answered by ? 3
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2x^2 + 12x + 18 = 0
2(x^2 + 6x + 9) = 0
2(x + 3)(x + 3) = 0
x + 3 = 0 x + 3 = 0
x = -3 x = -3
the solution is {-3}
to check your solution, substitute -3 back into your original equation:
2(-3)^2 + 12(-3) + 18 = 0
2(9) + (-36) +18 = 0
18 + (-36) +18 = 0
0 = 0
2006-11-10 00:08:33
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answer #3
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answered by Laurie V 4
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Earlier answer of -3 is correct if problem is truly 2x^2+12x+18=0.
2 (x^2+6x+18) =0
2 (x+3) (x+3) = 0
2=0 (x+3)=0 (x+3) = 0
unknown x=-3 x=-3
2006-11-10 00:07:54
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answer #4
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answered by jcbag 2
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2x^2+12x+18
=2(X^2+6x+9)
= 2 (x+3)^2
2006-11-10 00:45:18
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answer #5
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answered by grandpa 4
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first factor out the common factor 2
2 ( x ^ 2 + 6x + 9 )
then, notice that the first term inside is x^2 so just think of
two numbers that when you add the middle term 6 will result and when you multiply the answer will be 9
and that is 3 and three
it goes this way (x + 3 ) ( x + 3 )
and go to the question , it will become 2 ( x+3 ) ( x+3 )
2006-11-10 00:16:01
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answer #6
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answered by jdash01 3
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to solve for the value of x,
2x^2 + 12x + 18 = 0
(2x + 6) (x + 3) = 0
for (2x + 6) = 0,
x = -3
similarly, for (x + 3) = 0,
x = -3
2006-11-10 00:04:11
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answer #7
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answered by Blue™ 4
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x = -3
2006-11-10 00:00:20
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answer #8
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answered by djm3452004 2
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x=-3
2006-11-10 16:03:30
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answer #9
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answered by J 6
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Assuming you mean
2*x^2 +12*x+18=0
2*(x^2+6*x+9)=0
2*(x+3)(x+3)=0
x=-3 double root
2006-11-10 00:04:04
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answer #10
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answered by dragongml 3
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