Question

resolva as equações do segundo grau x (x-2)=2(x+6)

Answer 1

x.(x-2)=2.(x+6)
x²-2x=2x+12
x²-2x-2x-12=0
x²-4x-12=0

/\= b²-4.a.c
x= -b+-V/\ /2.a

a=1
b= -4
c= -12

/\= (-4)²-4.(1).(-12)
/\=16+48
/\=64

x'= -(-4)+8/2
x'=4+8/2
x'=12/2
x'=6

x"= -(-4)-8/2
x"=4-8/2
x"= -4/2
x"= -2

S={6,-2}

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