(2x+3)²=4x²+12x+9
(7y-6)²=49y²-84y+36
(10+8k)²=100+190k+64k²
(5y-4x)²=25y²-40xy+16x²
---
(a±b)²=a²±2ab+b²
(2x+3)²=4x²+12x+9
(7y-6)²=49y²-84y+36
(10+8k)²=100+190k+64k²
(5y-4x)²=25y²-40xy+16x²
---
(a±b)²=a²±2ab+b²