1. (a+x)² = a²+2ax+x²
2. (y-2)² = y²-4y+4
3. (2a+1)² = 4a²+4a+1
4. (3c-2)² = 9c²-12c+4
5. (7-a)² = 49-14a+a²
6. (x²+1)² = x⁴+2x²+1
7. (a²+3x)² = a⁴+6a²x + 9x²
8. (c²+d²)² = c⁴+2c²d²+d⁴
9. (a³+3b)² = a⁶+6a³b+9b²
17. 3(x-y)² = 3(x²-2xy+y²) = 3x²-6xy+3y² = 3x²+3y²-6xy
18. a²+(3a-b)² = a²+9a²-6ab+b² = 10a²+b²-6ab
19. (a-4)²+a(a+8) = a²-8a+16+a²+8a = 2a²+16
20. (a-c)(a+c)-(a-2c)² = a²-c²-a²+4ac-4c² = -5c²+4ac
Объяснение:
1. (a+x)² = a²+2ax+x²
2. (y-2)² = y²-4y+4
3. (2a+1)² = 4a²+4a+1
4. (3c-2)² = 9c²-12c+4
5. (7-a)² = 49-14a+a²
6. (x²+1)² = x⁴+2x²+1
7. (a²+3x)² = a⁴+6a²x + 9x²
8. (c²+d²)² = c⁴+2c²d²+d⁴
9. (a³+3b)² = a⁶+6a³b+9b²
17. 3(x-y)² = 3(x²-2xy+y²) = 3x²-6xy+3y² = 3x²+3y²-6xy
18. a²+(3a-b)² = a²+9a²-6ab+b² = 10a²+b²-6ab
19. (a-4)²+a(a+8) = a²-8a+16+a²+8a = 2a²+16
20. (a-c)(a+c)-(a-2c)² = a²-c²-a²+4ac-4c² = -5c²+4ac
Объяснение: