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(x+1)²-2(x-2)²=-(x-2)(x+2)
x²+2x+1-2x²+8x-8=-x²+4
10x=11 /:10
x=1,1
b)
3(x+6)+(x+√3)(x-√3)=(x+2)(x-2)
3x+18+x²-3=x²-4
3x=-19 /:3
x=-6 1/3
c)
y(y-6)+(y-3)(y+5)=(√2y+1)²
y²-6y+y²-15=2y²+1
-6y=16 /:(-6)
y=-2 2/3