-9x²+6x-4=0; x²-64=0;x²-49=0.... Pergunta de ideia deNanda18121971

Nanda18121971 @Nanda18121971

September 2019 1 18 Report

-9x²+6x-4=0; x²-64=0;x²-49=0

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jezebel -9x²+6x-4=0
a= -9 b=6 c=-4
Δ=36-144   Δ= -108
Delta menor que zero, a conta acaba aqui

x²-64=0 x= {-8,8}
a=1    b=0    c=-64
Δ=0²-4*1*(-64)   Δ=256   √Δ=√256   √Δ=16

x'=0+16/2 x'= 16/2    x'=8
x''= 0-16/2 x''= -16/2    x''= -8

x²-49=0    x={-7,7}
a=1    b=0    c= -49
Δ=0-4*1*(-49)
Δ=196     √Δ=√196     √Δ= 14
x'=14/2 x'=7
x''= -14/2 x''= -7

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