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(2x-y)(y+2x)+x(4-3x)....5c(c+1)-(b-3c)(b+3x).......(y-2)(y+2)+(3-y)(3+y)
(2x-y)(y+2x)+x(4-3x)....5c(c+1)-(b-3c)(b+3x).......(y-2)(y+2)+(3-y)(3+y)
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Answers & Comments
2)...= 5c^2 + 5c - (b^2-9c^2)= 5c^2+ 5c - b^2 + 9c^2 = 14c^2 - b^2 + 5c
3)...=y^2-4 + 9 - y^2=5