Question

x²-5x+4=0

x²-8x+15=0
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Answer 1

Resposta:

x²-5x+6=0

a=1

b=-5

c=6

∆=b²-4ac

∆=(-5)²-4(1)(6)

∆=25-24

∆=1

x=-b±√∆/2a

x=-(-5)±√1/2(1)

x=5±1/2

x'=5+1/2

x'=6/2

x'=3

x"=5-1/2

x"=4/2

x"=2

b)x²+8x+15=0

a=1

b=8

c=15

∆=b²-4ac

∆=(8)²-4(1)(15)

∆=64-60

∆=4

x=-b±√∆/2a

x=-8±√4/2(1)

x=-8±2/2

x'=-8+2/2

x'=-6/2

x'=-3

x"=-8-2/2

x"=-10/2

x"=-5

Explicação: