Rozwiąż i napisz odpowiedź X nalezy ....
x^2-5≤0
3x^2-4x>0
1)
x²-5 ≤ 0
Δ=b²-4ac
Δ=0-4*1*(-5)
Δ=0-4*(-5)
Δ=20
√Δ=√20=2√5
x₁= 0-2√5/2
x₁=-2√5/2 = -√5
x₂=0+2√5/2
x₂=2√5/2 = √5
x ∈ <-√5,√5>
2)
3x²-4x>0
Δ=16-4*3*0
Δ=16
√Δ=4
x₁=4-4/6=0/6=0
x₂=4+4/6=8/6= 1 i 1/3
x ∈ (-∞,0) u (1 i 1/3, +∞)
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1)
x²-5 ≤ 0
Δ=b²-4ac
Δ=0-4*1*(-5)
Δ=0-4*(-5)
Δ=20
√Δ=√20=2√5
x₁= 0-2√5/2
x₁=-2√5/2 = -√5
x₂=0+2√5/2
x₂=2√5/2 = √5
x ∈ <-√5,√5>
2)
3x²-4x>0
Δ=16-4*3*0
Δ=16
√Δ=4
x₁=4-4/6=0/6=0
x₂=4+4/6=8/6= 1 i 1/3
x ∈ (-∞,0) u (1 i 1/3, +∞)