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How to calculate (3a+2b+8c)+(2a-3b-5c) And (2xy+x squared-y squared)-(x squared-3xy) There must be a calculation process Urgent, And 3x squared -[5x+(4x-5)-9x squared
(3A+2b+8c)+(2a-3b-5c)
=3A+2b+8c+2a-3b-5c
=5A-b-3c
(2Xy+x2-y2)-(x2-3xy)
=2Xy+x2-y2-x2+3xy
=5Xy-y2
Calculation:(2a^3b^4)^2/(-3a^2b^5)
(2A^3b^4)^2/(-3a^2b^5)
=-6A^5b^9
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