Ответ:
Объяснение:
1) (2y - 3) * (5y + 1) = 2y + 2/5
10y²+2y-15y-3=2y+2/5
10y²-15y-3=2/5 // * 5
50y²-75y-15-2=0
50y²-75y-17=0
Δ=5625+3400=9025
√Δ=95
y1=(75-95)/100=-0,2
y2=(74+95)/100=1,7
2) -y * (y + 7) = (2 + y) * (y - 2)
-y²-7y = y^2-4
-2y²-7y+4=0 // *(-1)
2y²+7y-4=0
Δ=49+32=81
√Δ=9
y1=(-7-9)/4=-4
y2=(-7+9)/4=1/2
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Verified answer
Ответ:
Объяснение:
1) (2y - 3) * (5y + 1) = 2y + 2/5
10y²+2y-15y-3=2y+2/5
10y²-15y-3=2/5 // * 5
50y²-75y-15-2=0
50y²-75y-17=0
Δ=5625+3400=9025
√Δ=95
y1=(75-95)/100=-0,2
y2=(74+95)/100=1,7
2) -y * (y + 7) = (2 + y) * (y - 2)
-y²-7y = y^2-4
-2y²-7y+4=0 // *(-1)
2y²+7y-4=0
Δ=49+32=81
√Δ=9
y1=(-7-9)/4=-4
y2=(-7+9)/4=1/2