Question

Aflați x din :a)6-2x=4,b)(2-x)(x-4)=0

Answer 1

a)6-2x=4
   -2x=4-6
   -2x= -2
    x=-2/-2
    x=1
b)(2-x)(x-4)=0
    2x-8-x²+4x=0
    6x-8-x²=0
    -x²+6x-8=0
Δ=b²-4ac=6²-4×(-1)×(-8)=36-32=4
x1= -b-√Δ/2a= -6-√4/2×(-1)=4
x2= -b+√Δ/2a= -6+√4/2×(-1)=2

Answer 2

a)6-2x=4
2x=6-4
2x=2
x=2:2
x=2