Equations
Unfold
Math OP
Fold
Linear algebra
Unfold
Mathematical calculation：
Enter the mathematical formula directly and click the "Next" button to get the calculation answer.
It supports mathematical functions (including trigonometric functions).
Enter the mathematical formula directly and click the "Next" button to get the calculation answer.
It supports mathematical functions (including trigonometric functions).
Current location：Mathematical operation > History of Mathematical Computation > Answer
Overview: 1 questions will be solved this time.Among them
☆1 equations
[ 1/1 Equation]
Work: Find the solution of equation （x－20）（2x+80） = 150 .
Question type: Equation
Solution:Original question:
| ( | x | − | 20 | ) | ( | 2 | x | + | 80 | ) | = | 150 |
| Left side of the equation = | x | ( | 2 | x | + | 80 | ) | − | 20 | ( | 2 | x | + | 80 | ) |
| = | x | × | 2 | x | + | x | × | 80 | − | 20 | ( | 2 | x | + | 80 | ) |
| = | x | × | 2 | x | + | 80 | x | − | 20 | × | 2 | x | − | 20 | × | 80 |
| = | x | × | 2 | x | + | 80 | x | − | 40 | x | − | 1600 |
| = | x | × | 2 | x | + | 40 | x | − | 1600 |
| x | × | 2 | x | + | 40 | x | − | 1600 | = | 150 |
The solution of the equation:
x1≈-41.224990 , keep 6 decimal places
x2≈21.224990 , keep 6 decimal places
There are 2 solution(s).
解程的详细方法请参阅：《方程的解法》