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x²+8x+x+8=x²+5x+3x+15
9x+8=8x+15
9x-8x=15-8
x=7
b)(x-4)²-1=(x-3)(x-2)
x²-8x+16-1=x²-2x-3x+6
-8x+15=-5x+6
-8x+5x=6-15
-3x=-9/:(-3)
x=3
W razie wątpliwości pytaj śmiało
x^2-x^2+9x-8x=15-8
x=7
b) x^2-4x-4x+16-1=x^2-2x-3x+6
x^2-x^2-8x+5x=6+1-16
-3x=-9/ :(-3)
x=3