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2007-08-02 18:23:32 · 13 answers · asked by Jstevens 2 in Science & Mathematics Mathematics

13 answers

To solve:-
x² + 5x - 36 = 0
(x + 9) (x - 4) = 0
x = - 9 , x = 4

2007-08-02 19:07:42 · answer #1 · answered by Como 7 · 1 0

if x squared + 5x = 36 then, x squared +5x - 36= 0

then; there is an easy way to solve it. first you must separate the number (-36) into two numbers so that when you multiply these numbers with each other you get (-36) and when you add them to each other, to get 5. These precious numbers are (-4) and 9. So, here is the trick. Once you have found these numbers you write each of them next to the unknown which is "x" and multiply these two new numbers with each other;
(x-4)x(x+9)=0
Then you find that the answers are "4" and "(-9)" as;
1) if x-4=0 then, x=4
2) if x+9=0 then, x= -9

2007-08-03 03:34:46 · answer #2 · answered by Denizthenerd 2 · 0 1

x^2 + 5x = 36 or x^2 + 5x -- 36 = 0
finding factors of -- 36 whose sum is 5
we get (9)*(--4) = --36 and 9 + (--4) = 5
therefore x^2 + 5x -- 36 = 0
becomes x^2 + 9x -- 4x -- 36 = 0
whence x(x + 9) -- 4(x + 9) = 0
or (x + 9)(x -- 4) = 0
x + 9 = 0 gives x = --9 and
x -- 4 = 0 gives x = 4
hence x = --9, 4.

2007-08-03 02:01:18 · answer #3 · answered by sv 7 · 0 1

x^2+5x=36
x^2+5x-36=0
(x+9)(x-4)=0
x= -9 , 4

2007-08-03 01:29:52 · answer #4 · answered by enz_91 3 · 0 0

x^2+5x=36
x^2+5x-36=0
(x-4)(x+9)=0
Therefore
x-4=0 or x+9=0
x=4 or x=-9

2007-08-03 02:25:06 · answer #5 · answered by yenchin 2 · 0 1

x^2+5x=36
x^2+5x-36=0
(x+9)(x-4)=0
x+9=0/x-4=0
so x=-9/x=4

2007-08-03 01:50:22 · answer #6 · answered by mathavan velayutham 2 · 0 0

x^2 +5x = 36
x^2 + 5x -36 = 0
x^2 +9x -4x -36=0
x(x+9)-4(x+9)=0
(x+9)(x-4)=0
x+9=0 --> x=-9
or x-4=0 --> x=4

x=4, -9

2007-08-03 01:27:57 · answer #7 · answered by Jain 4 · 1 0

x^2 + 5x - 36 = (x+9)(x-4) = 0
x = -9, 4
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You are supposed to solve the equation.

2007-08-03 01:28:33 · answer #8 · answered by sahsjing 7 · 1 0

transfer 36 to the other side of the equation then factor it out x=4,-9.

2007-08-03 05:01:29 · answer #9 · answered by Newton-Raphson 1 · 0 1

(x+9)(x-4) = 0

2007-08-03 01:32:29 · answer #10 · answered by ironduke8159 7 · 1 0

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