Find the value of 2ab (a + b) - 3ab (a - b) when a = 1, b = 2 

The product of 2x and x -3y is 

x² + (a + b)x + ab =

Multiply: (x + 4)(2x - 5)

Add 7x² - 2z + 9 and 4x² - 8

The terms having same literal factors are called

Simplify a³ (b³ - c³) + b³ (c³ - a³) + c³ (a³ - b³) 

An expression which contains two more terms of the variable are called

The factors of a² - b² are 

20x² × 5y² =