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b = 8
c = -3
a+b-c = -5+8-(-3) = 6 (b)
13. 25x²y dan 30xy³
KPK = 25 dan 30 = 150
X² dan x = x²
y dan y³ = y³
FPB = 25 dan 30 = 5
x² dan x = x
y dan y³ = y
KPK dan FPB = 150x²y³ dan 5xy (d)
16. (2x + 6) ² = (2x + 6)(2x+6)
dikali satu persatu...
4x² + 12x + 12x + 36
= 4x² + 24x + 36 (c)
18. a²/x . 5b²/yz : 5ab²/xyz
= a²5b²xyz/xyz5ab²
dibagi sesuai variabel yang sama dan hanya tersisa a
= a (d)