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MariaLuisa
@MariaLuisa
May 2020
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A area do quadrado ABCD é igual a 121 cm quadrados. qual o valor de x? as medidas estao em cm. Medidas: (3x + 5) x (3x + 5)
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helviotedesco
Verified answer
X = 2 CM
(3*2 + 5) * (3*2 + 5) => (6+5)*(6+5) => 11 * 11 = 121CM
4 votes
Thanks 14
3478elc
(3x + 5) x (3x + 5) = 121
9x
² + 30x + 25 = 121
9x² + 30x + 25 - 121 = 0
9x² + 30x - 96 = 08
Δ = 30² - 4.9.(-96) ==> 900 + 3456 ==> 4356
x = - 30 +/-√4356 ==> x = -30 +/- 66
2.9 18
x1 = - 30 + 66 ==>
x1 = 2
18
x2 = - 30 - 66 ==> x1 = - 96 falso lado negativo
18 18
L = 3x + 5 ==> 3.(2) + 5 ==>
L = 11
9 votes
Thanks 28
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Verified answer
X = 2 CM(3*2 + 5) * (3*2 + 5) => (6+5)*(6+5) => 11 * 11 = 121CM
(3x + 5) x (3x + 5) = 121
9x² + 30x + 25 = 121
9x² + 30x + 25 - 121 = 0
9x² + 30x - 96 = 08
Δ = 30² - 4.9.(-96) ==> 900 + 3456 ==> 4356
x = - 30 +/-√4356 ==> x = -30 +/- 66
2.9 18
x1 = - 30 + 66 ==> x1 = 2
18
x2 = - 30 - 66 ==> x1 = - 96 falso lado negativo
18 18
L = 3x + 5 ==> 3.(2) + 5 ==> L = 11