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The length of a photograph is 1 cm less than twice the width. The Area is 91 cm² find the width and length

Respuesta :

vunderkid
{a*b=91
{a-1=2b

a=2b-1
(2b-1)*b=91
2b²-b-91=0
b=7 cm
other b is negative and can't be a width
a=2*7-1=13 cm
Length is 13 cm
Width is 7 cm

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