Simplified evaluation: 2 (x + y) &# 178; - 5 (x + y) (X-Y) + 3 (X-Y) &# 178;, where x = 5 / 2, y = 3 / 5 | Math enthusiast | Mathematical art

Simplified evaluation: 2 (x + y) &# 178; - 5 (x + y) (X-Y) + 3 (X-Y) &# 178;, where x = 5 / 2, y = 3 / 5

Original formula = 2x & # 178; + 4xy + 2Y & # 178; - 5x & # 178; + 5Y & # 178; + 3x & # 178; - 6xy + 3Y & # 178;
=-2xy+10y²
=-2*5/2*3/5+10*9/25
=-3+18/5
=-3/5

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