SOLUTION: Solve the problem, if possible. Round your answer to the nearest tenth, when appropriate. A book has pages that are 16cm by 20cm The printed matter on a page of the book must

Question 48755: Solve the problem, if possible. Round your answer to the nearest tenth, when appropriate.
A book has pages that are 16cm by 20cm The printed matter on a page of the book must cover . If all margins are to be the same width, how wide should the margins be?
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
16*20=320 area of the page & (16-2x)(20-2x)=140 or 320-40x-32x+4x~2=140 or
4x~2-72x+180=0 or x~2-18x+45=0 or (x-3)(x+15)=0 or x=3 & x=-15 therefore the margin is 3 cm.
proof (16-6)(20-6)=140 or 10*14=140 or 140=140
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