x² + 6x + 36 -(169 -26x + x²)=2(x²-6x+9)+25
1/4x²+6x+36-169+26x-x²=2x²-12x+18+25
-3/4x²+32x-133=2x²-12x+43
-3x²+128x-532=8x²+48x+172
-3x²+128x-532-8x²+48x-172=0
-11x²+176x-704=0
x²-16x+64=0
(x-8)²=0
x-8=0
x=8
Espero que te sirva y entiendas todo. Saludos :)
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1/4x²+6x+36-169+26x-x²=2x²-12x+18+25
-3/4x²+32x-133=2x²-12x+43
-3x²+128x-532=8x²+48x+172
-3x²+128x-532-8x²+48x-172=0
-11x²+176x-704=0
x²-16x+64=0
(x-8)²=0
x-8=0
x=8
Espero que te sirva y entiendas todo. Saludos :)