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x²-9-x²+1=x²+25
2x-2x-2x=25+9
-2x=34 /:-2
x= -17
b) (x-3)(x+3) - ( x-2)² =0,25(x+4)²
x²+3x-3x-9 -x²+4 = 0,25(x²+16)
-9+4 = 0,5x+16
-0,5x = 16+9-4
0,5x= 21 /*2
x=42