rozłóz na czynniki
1. zadanie -2 +20x -50 =
2 .zadanie -5x+4=
3.zadanie 1+x-2=
Prosze o szybka pomoc
1. y= -2x²+20x-50 = 2x²-20x+50 = x²-10x+25 = (x-5)²
tu pierw pomnozylam przez -1, potem podzielilam przez 2 i masz wzor skroconego mnozenia :)
2. y=x²-5x+4
Δ= 25-16=9
x1= 1; x2=4
y= (x-1)(x-4)
3. 1+x-2x² = -2x²+x+1
Δ = 1+8=9
x1= (1-3)/-4 = -2/-4 = 1/2 ; x2 = (1+3)/-4 = -1
y = (x+1)(x-1/2)
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1. y= -2x²+20x-50 = 2x²-20x+50 = x²-10x+25 = (x-5)²
tu pierw pomnozylam przez -1, potem podzielilam przez 2 i masz wzor skroconego mnozenia :)
2. y=x²-5x+4
Δ= 25-16=9
x1= 1; x2=4
y= (x-1)(x-4)
3. 1+x-2x² = -2x²+x+1
Δ = 1+8=9
x1= (1-3)/-4 = -2/-4 = 1/2 ; x2 = (1+3)/-4 = -1
y = (x+1)(x-1/2)