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b) y=3x(x-2)
c) y=(2x-7)(2x+7)
a)
y= -x²+4x+5
Δ=4²-4·(-1)·5=16+20=36
√Δ=6
x₁=(-4-6):(-2)
x₁=5
x₂=(-4+6):(-2)
x₂=-1
y=-(x-5)(x+1)
b)
y= 3x²-6x=3x(x-2)
c)
y= 4x²-49=(2x-7)(2x+7)
-x²+4x+5=y
-x²+5x-x+5=y
-x(x-5)-1(x-5)=y
(-x-1)(x-5)=y
-(x+1)(x-5)=y
b)
3x²-6x=y
3x(x-2)=y
c)
4x²-49=y
(2x-7)(2x+7)=y