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x²+6x+9=4x²-4x+1
-3x²+10x+8=0
Δ=b²-4ac
Δ=10²-4*(-3)*8=100+96=196
√Δ=14
x₁=-b+√Δ/2a=-10+14/-6=4/-6=-⅔
x₂=-b-√Δ/2a=-10-14/-6=-24/-6=4
2
y=x^2+8x+15
x²+8x+15=0
Δ=8²-4*1*15=64-60=4
√Δ=2
x₁=-8+2/2=-6/2=-3
x₂=-8-2/2=-10/2=-5
a)
x^2+6x+9=(2x-1)^2
2X +6X +9=4X-2
8X-4X=-2-9
4X=-11 :4
X= -11:4
b)
(2x-4)(x-100)=(x+6)(x-100)
2Xa - 200x - 4x +400=xa -100x +6x -600
2xa -xa -204 +96=1000
xa - 108= 1000
gdzie a= do kwadratu
zad 2
y=10x +15 i teraz nalezy narysowac i przetna sie punkty:))