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b)=4x²+16x+16-4x²-16=16x
c)49-14y+y²+y²+14y+49+1=2y²+99
b) ( 2x+4)² - 4x²-16=4x²+16-4x²-16=0
c) 9x² - 25 + (3x-5)(3x+5) - 2x=9x²-25+9x²+15x-15x-25=18x²-50
d)(7-y)² + (y+7)² + 1=49+y²+y²+49=98+2y²