If you are asked to multiply out an expression such as (a - 5)2, remember that squaring means multiplying by itself.
Multiply out (a - 5)2
Write down the expression: (a - 5)2
Expand the expression by writing it out: (a - 5) (a - 5)
Everything in the first bracket is multiplied by the second bracket: a(a - 5) - 5(a - 5)
Expand the brackets, by multiplying everything inside the brackets by the term outside the bracket:
1: a × a = a2 2: a × -5 = -5a 3: - 5 × a = -5a 4: - 5 × - 5 = 25
Expression: a2 - 5a - 5a + 25, Simplified: a2 - 10a + 25
Comments
No comments have yet been made