Sec 2 Algebra 3: 3 Formulas

Select the correct formula for (a + b) ².

• a² + ab + b²

• a² + 2ab + b²

• a² + b²

• a + 2ab + b

Select the correct formula for ( a - b )².

• a² + 2ab - b²

• a² - ab + b²

• a² - 2ab + b²

• a² - 2ab - b²

Select the correct formula for (a+b) (a-b).

• a² + b²

• a - b²

• a² - b

• a² - b²

Expand and simplify (3x + 4)(2-x)-3(x-1). Do not leave any space in your answer.

(a)  

Factorise completely x^2 + 7x - 7xy- 49y.

(a)  

Factorise completely (p + 3)^2-(2q-1)^2 using special products of algebraic expressions.

(a)