Simplify:
a−[a−¯¯¯¯¯¯¯¯¯¯¯¯b+a−{a−(a−¯¯¯¯¯¯¯¯¯¯¯¯b−a)}]
a−[a−¯¯¯¯¯¯¯¯¯¯¯¯b+a−{a−(a−¯¯¯¯¯¯¯¯¯¯¯¯b−a)}]=a−[a−b−a−{a−(a−b+a)}]=a−[−b−{a−a+b−a}]=a−[−b−b+a]=a+b+b−a=2b
Simplify: (a+b+c)×(a+b−c)
Simplify: a−4 × b3 × c5 × d−7a−7 × b−3 × c2 × d−9
Question 3(vii) Simplify: (a+b+c)(a+b-c)
Simplify: (a−b)2+4ab