Réponse :
bonjour
e x²-8=17
x²=17+8=25
x=√25=5
f
(x-8)²=36
x²-16x+64-36=0
x²-16x+28=0
Δ=(-16)²-4×1×28=144
16-√144/2=2
16+√144/2=14
solution 2 et 14
g
2x²-8=120
2x²=120+8=128
x²=128/2=64
x=√64=8
h
(2x)²-8=392
4x²-8=392
4x²=392+8=400
x²=400/4=100
x=√100=10
i
2(x-8)²=3362
2(x²-16x+64)=3362
2x²-32x+128=3362
2x²-32x+128-3362=0
2x²-32x-3234=0
Δ(-32)²-4×2×(-3234)=26896
32-√26896/4=-33
32+√26896/4=49
solution -33 et 49
Explications étape par étape
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Réponse :
bonjour
e x²-8=17
x²=17+8=25
x=√25=5
f
(x-8)²=36
x²-16x+64-36=0
x²-16x+28=0
Δ=(-16)²-4×1×28=144
16-√144/2=2
16+√144/2=14
solution 2 et 14
g
2x²-8=120
2x²=120+8=128
x²=128/2=64
x=√64=8
h
(2x)²-8=392
4x²-8=392
4x²=392+8=400
x²=400/4=100
x=√100=10
i
2(x-8)²=3362
2(x²-16x+64)=3362
2x²-32x+128=3362
2x²-32x+128-3362=0
2x²-32x-3234=0
Δ(-32)²-4×2×(-3234)=26896
32-√26896/4=-33
32+√26896/4=49
solution -33 et 49
Explications étape par étape