25x^2(a-b)^2+40xy(a-b)+16y^2
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25x^2(a-b)^2+40xy(a-b)+16y^225x^2(a-b)^2+40xy(a-b)+16y^225x^2(a-b)^2+40xy(a-b)+16y^225x²(a-b)
25x^2(a-b)^2+40xy(a-b)+16y^2
25x^2(a-b)^2+40xy(a-b)+16y^2
25x^2(a-b)^2+40xy(a-b)+16y^2
25 x ² (a - b)² + 40 x y(a - b)+ 16 y ²
= 【5 x(a - b)】² + 2 × 5 x(a - b)· 4 y + (4 y)²
= 【5 x(a - b)+ 4 y 】²
= (5 x a - 5 x b + 4 y)²
25x^2(a-b)^2+40xy(a-b)+16y^2
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