1)
(x-5)²-7 = x²-10x+25-7 = x²-10x+18
2)
(4m+3n)²+(2m-6n)²= 16m²+24mn+9n²+4m²-24mn+36n² = 20m²+45n²
3)
X(x-2)-(x-3)² = x²-2x-(x²-6x+9) = x²-2x-x²+6x-9 = 4x-9
1)
(x-5)²-7 = x²-10x+25-7 = x²-10x+18
2)
(4m+3n)²+(2m-6n)²= 16m²+24mn+9n²+4m²-24mn+36n² = 20m²+45n²
3)
X(x-2)-(x-3)² = x²-2x-(x²-6x+9) = x²-2x-x²+6x-9 = 4x-9