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Simmons56
@Simmons56
October 2019
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A soma de um numero com o seu quadrado é 90. Calcule esse numero.
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XiaoMaria
9² = 81 +9
9x9= 81+9= 90
0 votes
Thanks 1
lu1303
X + x² = 90
x + x² - 90 = 0
Baskara
∆= b²-4ac
∆= 1²-4.1.(-90)
∆= 1 +360
∆= 361
x= -b±√∆/2a
x¹= -1+√321/2.1
x¹= -1+19/2
x¹= 18/2
x¹= 9
x²= -1-19/2
x²= -20/2
x²= -10
9 ou -10
2 votes
Thanks 1
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Lista de comentários
9x9= 81+9= 90
x + x² - 90 = 0
Baskara
∆= b²-4ac
∆= 1²-4.1.(-90)
∆= 1 +360
∆= 361
x= -b±√∆/2a
x¹= -1+√321/2.1
x¹= -1+19/2
x¹= 18/2
x¹= 9
x²= -1-19/2
x²= -20/2
x²= -10
9 ou -10