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1-4x+4x²-9x²-6x+18x+12-49+14x-x²+16=0
-6x²+22x-20=0
Δ=b²-4ac
Δ=22²-4*(-6)*(-20)=484-480=4
√Δ=2
b)
11(3x²+3)-11=4(x+5)²-(1-2x)²
33x²+22=4x²+40x+100-1+4x-4x²
33x²+22=44x+99
33x²+22-44x-99=0
33x²-44x-77=0 /:11
3x²-4x-7=0
Δ=b²-4ac
Δ=(-4)²-4*3*(-7)=16+84=100
√Δ=10
1-4x+4x²-9x²-6x+18x+12-49+14x-x²+16=0
-6x²+22x-20=0
Δ=b²-4ac
Δ=484-480
Δ=4
√Δ=2
b)
33x²+22=4x²+40x+100-1+4x-4x²
33x²+22=44x+99
33x²+22-44x-99=0
33x²-44x-77=0 /:11
3x²-4x-7=0
Δ=b²-4ac
Δ=16+84
Δ=100
√Δ=10