(100-X)(80-X)=7644

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(100-X)(80-X)=7644

(100-X)(80-X)=7644
(100-X)(80-X)=7644

(100-X)(80-X)=7644
(100-X)(80-X)=7644
8000-180x+x²=7644
x²-180x+356=0
(x-2)(x-178)=0
x1=2,x2=178

8000-180x+x²=7644
x²-180x+356=0
(x-178)(x-2)=0
∴x=178 x=2