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Using the identity \((x + a)(x + b) = x^2 + x(a + b) + ab\), find the following product.
(i) \((4x + 3y)(4x + 5y) =\)
(ii) \((8 + pq)(pq + 7) =\)
Answer variants:
\(p^2q^2 + 32pq - 15\)
\(p^2q^2 + 32pq + 15\)
\(x^2y^2 + 15xy + 56\)
\(a^2 - 10a + 21\)
\(pq^2 + 15pq + 56\)
\(p^2q^2 + 15pq + 56\)
\(16x^2 + 32xy + 15y^2\)
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