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    Work: Find the solution of equation （-2x+160）（x-30） = 1400 .
    Question type: Equation
    Solution:Original question:

(

-

2

x

+

160

)

(

x

−

30

)

=

1400

    Remove the bracket on the left of the equation:

Left side of the equation =

-

2

x

(

x

−

30

)

+

160

(

x

−

30

)

=

-

2

x

x

+

2

x

×

30

+

160

(

x

−

30

)

=

-

2

x

x

+

60

x

+

160

(

x

−

30

)

=

-

2

x

x

+

60

x

+

160

x

−

160

×

30

=

-

2

x

x

+

60

x

+

160

x

−

4800

=

-

2

x

x

+

220

x

−

4800

    The equation is transformed into :

-

2

x

x

+

220

x

−

4800

=

1400

    This equation has no real solution!

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