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LucasTartarini
@LucasTartarini
January 2020
1
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Encontre o valor de X:
1° X/2 -15=50
(É FRAÇÃO O X/2)
2° 3X+5X=88
3° X-1 - 3 = 0
----
4
4° 2X(X+1)=12
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rosanev
1. x/2 - 15 = 50
x/2 = 50 + 15
x/2 = 65
x = 65.2
x = 130
2. 3x + 5x = 88
8x = 88
x = 88/8
x = 10
3. x - 1 - 3 = 0
x - 4 = 0
x = 4
4. 2x(x+1) = 12
2x² + 2x = 12
2x² + 2x - 12 = 0
Δ = 2² - 4.2.(-12) = 4 + 96 = 100
x = (-2 +- √100)/2.2
x' = -2 + 10/4 = -8/4 = -2
x" = -2 - 10/4 = -12/4 = -3
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x/2 = 50 + 15
x/2 = 65
x = 65.2
x = 130
2. 3x + 5x = 88
8x = 88
x = 88/8
x = 10
3. x - 1 - 3 = 0
x - 4 = 0
x = 4
4. 2x(x+1) = 12
2x² + 2x = 12
2x² + 2x - 12 = 0
Δ = 2² - 4.2.(-12) = 4 + 96 = 100
x = (-2 +- √100)/2.2
x' = -2 + 10/4 = -8/4 = -2
x" = -2 - 10/4 = -12/4 = -3