Question

qual a raiz de x² + x – 7 = 5

Answer 1

Olá

x²+x-7=5

x²+x-12=0

∆==b²-4.a.c

∆=(1)²-4.(1).(-12)

∆=1+48>∆=49

x=B+√∆/2.a

x=1+√49/2.1

x= -1+ -7/2

x= -1+7/2>>6/2>>3

x=-1-7/2>>6/2>>3

x=-1 -7/2>>-8/2>>-4

conjunto de solução (3 -4)

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