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  • Usuário do Brainly
2014-06-04T16:58:48-03:00


(30 +x)(40+x)=2000

1200 +30x +40x +x² =2000

x² +70x -800=0

Δ=4900+3200 =8100  √Δ=90

x=( -70 +90)/2                                         30 +10=40

x=20/2                                                      40 +10=50

x=10                    as medidas são 40cm e 50cm

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