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A.n(n+2)+1=(n+1)2 | B.n(n+2)+1=n2 |
C.n(n+2)+1=n2+2n | D.n(n+2)+1=n2-2n |
A.4x2-9=(2x+3)(2x-3) | B.y2-6y+9=(y-3)2 |
C.x2+4xy+4y2=(x+2y)2 | D.4x2+8x-1=4x(x+2)-1 |
A.-a2+b2 | B.x2-2x+4 | C.-4m2-9n2 | D.x2+4y2 |
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