(x + 10) (x - 2) = 0
x = - 10 , x = 2
2007-11-22 05:46:57
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answer #1
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answered by Como 7
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x = 2
2007-11-18 17:32:03
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answer #2
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answered by Booboo 2
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x^2 + 8x --20 = 0
=> x^2 + 10x --2x --20 = 0
=> x(x + 10) --2(x + 10) = 0
=> (x + 10)(x --2) = 0
when x + 10 = 0 => x = --10.
when x --2 = 0 => x = 2.
2007-11-18 17:35:49
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answer #3
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answered by sv 7
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Simplifying
x^2 + 8x + -20 = 0
Reorder the terms:
-20 + 8x + x^2 = 0
Solving
-20 + 8x + x^2 = 0
Solving for variable 'x'.
Factor a trinomial.
(-10 + -1x)(2 + -1x) = 0
Subproblem 1
Set the factor '(-10 + -1x)' equal to zero and attempt to solve:
Simplifying
-10 + -1x = 0
Solving
-10 + -1x = 0
Move all terms containing x to the left, all other terms to the right.
Add '10' to each side of the equation.
-10 + 10 + -1x = 0 + 10
Combine like terms: -10 + 10 = 0
0 + -1x = 0 + 10
-1x = 0 + 10
Combine like terms: 0 + 10 = 10
-1x = 10
Divide each side by '-1'.
x = -10
Simplifying
x = -10
Subproblem 2
Set the factor '(2 + -1x)' equal to zero and attempt to solve:
Simplifying
2 + -1x = 0
Solving
2 + -1x = 0
Move all terms containing x to the left, all other terms to the right.
Add '-2' to each side of the equation.
2 + -2 + -1x = 0 + -2
Combine like terms: 2 + -2 = 0
0 + -1x = 0 + -2
-1x = 0 + -2
Combine like terms: 0 + -2 = -2
-1x = -2
Divide each side by '-1'.
x = 2
Simplifying
x = 2
Solution
x = {-10, 2}
2007-11-18 17:53:38
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answer #4
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answered by Anonymous
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to factor this equation you need to find two factors of -20 that add up to 8
so, the smaller number will be negative, and bigger number will be positive, and the difference between them is 8
factors of 20 are
1, 20
2, 10
4, 5
-2 x 10 = 20, and -2 + 10 = 8, so the factors are
(x-2)(x+10)=0
zero product property: if the product of two numbers is zero, then one of the numbers is zero.
so, x-2=0 or x+10=0
solve, and you get: x=2 or x=-10
2007-11-18 17:40:46
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answer #5
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answered by Valerie 1
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x^2+8x-20=0
x^2+10x-2x-20=0
x(x+10)-2(x+10)=0
(x+10)(x-2=)=0
x=2,-10 ANS.
2007-11-18 17:34:21
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answer #6
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answered by Anonymous
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i don't know if you have called it factorising becuase you spelt it wrong or if it is it's name in america but in england we call it factorising, spelt with an s not a z
x^2+8x-20=0
(x-2)(x+10)
x=-10,2
2007-11-18 17:31:39
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answer #7
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answered by stuartelliott797 2
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