• #### 1.  The factorisation of a³ + a²b + ab² is

• a(a² + ab + b²)
• b(a² + ab + b²)
• ab(a² + ab + b²)
• none of these
• #### 2.  The factorisation of x²yz + xy²z + xyz² is

• xyz(x + y + z)
• x²yz(x + y + z)
• xy²z(x + y + z)
• xyz²(x + y + z)
• #### 3.  The factorisation of ax²y + bxy² + cxyz is

• xy(ax + by + cz)
• axy(ax + by + cz)
• bxy(ax + by + cz)
• cxy(ax + by + cz)
• #### 4.  The factorisation of a (x + y + z) + b(x + y + z) + c(x + y + z) is

• (a + b + c)(x + y + z)
• (ab + bc + ca)(x + y + z)
• (xy + yz + zx)(a + b + c)
• none of these
• #### 5.  The factorisation of 6xy - 4y + 6 - 9x is

• (3x - 2)(2y - 3)
• (3x + 2)(2y - 3)
• (3x - 2)(2y + 3)
• (3x + 2)(2y + 3)
• #### 6.  The factorisation of x² + xy + 2x + 2y is

• (x + 2)(x + y)
• (x + 2)(x - y)
• (x - 2)(x + y)
• (x - 2)(x - y)
• #### 7.  The factorisation of ax + bx - ay - by is

• (x - y)(a + b)
• (x + y)(a + b)
• (x - y)(a - b)
• (x + y)(a - b)
• #### 8.  The factorisation of ab - a - b + 1 is

• (a - 1)(b - 1)
• (a + 1)(b + 1)
• (a - 1)(b + 1)
• (a + 1)(b - 1)
• #### 9.  The factorisation of x² + x + xy + y + zx + z is

• (x + y + z)(x + 1)
• (x + y + z)(x + y)
• (x + y + z)(y + z)
• (x + y + z)(z + x)
• #### 10.  The factorisation of x²y² + xy + xy²z + yz + x²yz + xz is

• (xy + yz + zx)(xy + 1)
• (xy + yz + zx)(yz + 1)
• (xy + yz + zx)(zx + 1)
• none of these
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