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    Work: Find the solution of equation 8x(x+9) = 112 .
    Question type: Equation
    Solution:Original question:

8

x

(

x

+

9

)

=

112

    Remove the bracket on the left of the equation:

Left side of the equation =

8

x

x

+

8

x

×

9

=

8

x

x

+

72

x

    The equation is transformed into :

8

x

x

+

72

x

=

112

    The solution of the equation:
        x₁≈-10.352350 , keep 6 decimal places
        x₂≈1.352350 , keep 6 decimal places    
    There are 2 solution(s).

解程的详细方法请参阅：《方程的解法》

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