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= 25x² + 10xy + 10xy + 4y²
= (25x² +10xy) + (10xy + 4y²)
= 5x(5x + 2y) + 2y( 5x + 2y)
= (5x +2y)(5x+2y)
= (5x+2y)^2
b) 49 - 70x+ 25x² =
= (7 - 5x)²
c) 64 -112p + 49 p²
= (8- 7p)²