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b) 25+10y+ y² = ( 5 + y)²
c) (x-7)x+3(7-x) = -(7 -x)x + 3( 7 - x) = (7 - x)(3 - x)
d) 8x³ - 1 = (2x)³ - 1³ = (2x - 1) (4x² + 2x + 1)