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Work: Find the solution of equation 2x(3x-5)-(2x-3)(3x+4) = 3(x+4) .
Question type: Equation
Solution:Original question:| | 2 | x | ( | 3 | x | − | 5 | ) | − | ( | 2 | x | − | 3 | ) | ( | 3 | x | + | 4 | ) | = | 3 | ( | x | + | 4 | ) |
Remove the bracket on the left of the equation:
| Left side of the equation = | 2 | x | × | 3 | x | − | 2 | x | × | 5 | − | ( | 2 | x | − | 3 | ) | ( | 3 | x | + | 4 | ) |
| = | 6 | x | x | − | 10 | x | − | ( | 2 | x | − | 3 | ) | ( | 3 | x | + | 4 | ) |
| = | 6 | x | x | − | 10 | x | − | 2 | x | ( | 3 | x | + | 4 | ) | + | 3 | ( | 3 | x | + | 4 | ) |
| = | 6 | x | x | − | 10 | x | − | 2 | x | × | 3 | x | − | 2 | x | × | 4 |
| = | 6 | x | x | − | 10 | x | − | 6 | x | x | − | 8 | x | + | 3 | ( | 3 | x | + | 4 | ) |
| = | 6 | x | x | − | 18 | x | − | 6 | x | x | + | 3 | ( | 3 | x | + | 4 | ) |
| = | 6 | x | x | − | 18 | x | − | 6 | x | x | + | 3 | × | 3 | x | + | 3 |
| = | 6 | x | x | − | 18 | x | − | 6 | x | x | + | 9 | x | + | 12 |
| = | 6 | x | x | − | 9 | x | − | 6 | x | x | + | 12 |
The equation is transformed into :
| | 6 | x | x | − | 9 | x | − | 6 | x | x | + | 12 | = | 3 | ( | x | + | 4 | ) |
Remove the bracket on the right of the equation:
| Right side of the equation = | 3 | x | + | 3 | × | 4 |
The equation is transformed into :
| | 6 | x | x | − | 9 | x | − | 6 | x | x | + | 12 | = | 3 | x | + | 12 |
the solutions is:
x=0
There are 1 solution(s).
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