Integers and algebra

The value of 5x when x=5 is

• -5

• 25

• 10

• 5

Solve: -5x - - 3 = 33

• 6

• -6

• -25

Which of the following is the value of (x+ 1/x)²?

•  x² + 1/x²

• x² - 1/x²

•  x² + 1/x² + 2

•  x²+ 1/x² + 2x

What is the value of 5x²⁵ - 3x³² + 2x¹² at x=1?

• 1

• 2

• 3

• 4

If x²+kx+6 = (x+2)(x+3), find the value of k.

• -1

• 2

• 1

• 5

If x + y = 3, x² + y² = 5 then xy is

• 1

• 3

• 2

• 5

Factorise (a²b-b²a)²

• a²b²-2ab-a²b²

• a⁴b²-2a²b²+a²b⁴

• a⁴b²-2a³b³+a²b⁴

• a²b-2a³b³+ab²

Factorise x²+4y²+16z²+4xy+16yz-8zx

• (x+2y-4z)²

• 4(x²+y²+4z²+xy+4yz-2zx)

• 16(x²+y²+z²+xy+yz-zx)

• (x+2y+z)²