(2x + 5y) (2x + 3y) का गुणनफल ज्ञात करने के लिये
सर्वसमिका (x+a) (x+b) =Y+2ah का प्रयोग
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2x2+(5y+3y)2x+5y×3y
4x+8yx+15y2
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