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Wallace3256
@Wallace3256
January 2020
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Qual o número cujo "quadrado de um número menos o seu triplo é igual a 40
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yagotricolor20
Verified answer
X²-3x=40
x²-3X-40=0
Δ= -3² -4.1.(-40)
Δ= 9 + 160
Δ=169
X= -b+-√¯
Δ
__________
2a
x=3+-13
_______
2
x'= 3+13
_____
2
x'=8
x''= 3-13
_____
2
x''= -5
2 votes
Thanks 1
wallace3256
Tanto faz 5 ou -8
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Verified answer
X²-3x=40x²-3X-40=0
Δ= -3² -4.1.(-40)
Δ= 9 + 160
Δ=169
X= -b+-√¯Δ
__________
2a
x=3+-13
_______
2
x'= 3+13
_____
2
x'=8
x''= 3-13
_____
2
x''= -5