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