bonjour
5(x-0.2)²-3.2
5(x²-0.4x+0.04)-3.2
5x²-2x+0.2-3.2
5x²-2x-3
Δ=2²-4(5)(-3)
Δ=4+60
Δ=64
√Δ=8
x1=2+8/10 x1=10/10=1
x2=2-8/10=-6/10 x2=-0.6
d'où
factorisation
5(x-1)(x+0.6)
5(x+0.2)²-3.2=5(x+0.6)(x-1)
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bonjour
5(x-0.2)²-3.2
5(x²-0.4x+0.04)-3.2
5x²-2x+0.2-3.2
5x²-2x-3
Δ=2²-4(5)(-3)
Δ=4+60
Δ=64
√Δ=8
x1=2+8/10 x1=10/10=1
x2=2-8/10=-6/10 x2=-0.6
d'où
factorisation
5(x-1)(x+0.6)
5(x+0.2)²-3.2=5(x+0.6)(x-1)