In (3x-2y)(2x+5y), the coefficient of xy is

• 7
• 11
• −11
• −7

12a^3b^2 / (-4ab) equals

• −3a^2b
• 3a^2b
• −3ab^2
• 3ab^2

Simplify (x^2-9)/(x-3) for x ≠ 3.

• x−3
• x+3
• x^2+3
• x+9

In (a+b)^3, the coefficient of ab(a+b) equals

• 1
• 2
• 3
• 6

(a+b)^3 - (a-b)^3 equals

• 2(3a^2b+b^2)
• 6a^2b+2b^3
• 6ab^2+2a^3
• 2(3ab^2+a^3)

If x+y+z=0, then x^3+y^3+z^3 equals

• 0
• 3xyz
• x^2+y^2+z^2
• xyz

Value of 101×99 using identities is

• 10000
• 9999
• 9901
• 10100

Factorise: 25a^2-9b^2

• (5a−3b)^2
• (5a−3b)(5a+3b)
• (5a+3b)^2
• (5a−9b)(5a+b)

Factorise using cubes: a^3+27b^3

• (a+3b)(a^2+9b^2+3ab)
• (a+3b)(a^2−3ab+9b^2)
• (a−3b)(a^2+3ab+9b^2)
• (a−3b)(a^2−9b^2)

If (x-1) is a factor of x^2-kx+1, then k equals

• 0
• 1
• 2
• −2