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Check whether the following are perfect ...

Check whether the following are perfect squares or not :
(a) `64x^(2) + 81y^(2) - 144 xy`
(b) `4x^(2) + 8y^(2) + 16 xy`

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In each case, find whether the trinomial is a perfect square or not : (v) 16x^(2) - 16 xy + y^(2)

Factorise : 64 x^(2) - 81y^(2)

Subtract : 6x ^(2) - 4 xy + 5y ^(2) from 8y ^(2) + 6 xy - 3x ^(2)

Add : 4x^(2)y, - 3xy^(2), -5xy^(2), 5x^(2)y

x^(3) + x^(2)y+ xy^(2) + y^(3) = 81

(b) Factorize 4x^(3) - 10y^(3) - 8x^(2) y + 5xy^(2)

Factorise : 27x^(3) - 64y^(3) - 108 x^(2)y + 144 xy^(2)

12xy (9x ^ (2) -16y ^ (2)) -: 4xy (3x + 4y)