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= 5x²+2x²+6x-3x+5+8
= 7x²+3x+13
2. 2x²+y(-3+y)
= 2x²-3y+y²
3. (2x+5)(x-3)
= 2x²-6x+5x-15
= 2x²-x-15
4. (18x³+y²):(9x+y²)
= 2x²
5. x²/x : x+3/3x
= x²/x. dikali 3x/x+3
ditembak
= 3x/3
= x
6. f(x) = 3x -1
f(a) = -20
-20= 3a-1
-20+1 = 3a
-19 = 3a
a = -3/19
terima Kasih.