№2
а)x^2-14x+49=x^2-2*7*x+49=(x-7)^2
б)25y^2+20xy+4x^2=25y^2+2*2*5*x*y+4x^2=(5y+2x)^2
№3
а)(5x-3y)^2+30yx=25x^2-30xy+9y^2+30xy=25x^2+9y^2
б)4x^4-2(x^4+1)^2=4x^4-2x^8-2-4x^4=-2x^8-2
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Answers & Comments
№2
а)x^2-14x+49=x^2-2*7*x+49=(x-7)^2
б)25y^2+20xy+4x^2=25y^2+2*2*5*x*y+4x^2=(5y+2x)^2
№3
а)(5x-3y)^2+30yx=25x^2-30xy+9y^2+30xy=25x^2+9y^2
б)4x^4-2(x^4+1)^2=4x^4-2x^8-2-4x^4=-2x^8-2