Given a = 2x2 + 3xy-2x-1, B = - x2 + XY-1, find 3A + 6B
∵A=2x2+3xy-2x-1,B=-x2+xy-1,∴3A+6B=3(2x2+3xy-2x-1)+6(-x2+xy-1)=6x2+9xy-6x-3-6x2+6xy-6=15xy-6x-9.
4xy+6xy-3xy=?
7xy
If a = 8x ^ 2 · y-6xy ^ 2-3xy
B = 7xy ^ 2-2xy + 5x ^ 2Y. And C = 3 (a + b). Find the value of C-2A
It's a + 3B. I'll do it by myself
Calculation, 1.25x & # 179; * [- 8x & # 178;] [6xy & # 178;] & # 178;] / 3xy
Two questions
1.25x & # 179; * [- 8x & # 178;] = - 10 times the quintic power of X
【6xy²】²/3xy = 2xy³