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4

Simplify:

(i)

(ii)

(iii)

(iv)

(v) (vi)

∵ (a + b) (a - b) = a^{2} - b^{2}

=

(ii)

∵ (a + b) (a - b) = a^{2} - b^{2}

(iii)

∵ (a + b) (a - b) = a^{2} - b^{2}

=

=

=

(v)

∵ (a - b)^{2} = a^{2} + b^{2} - 2ab

=

(vi)

∵ (a - b)^{2} = a^{2} + b^{2} - 2ab

=