question_answer

Multiply the following :

(a) \[15x{{y}^{2}},17y{{z}^{2}}\]

(b) \[-5{{a}^{2}}bc,11ab,13ab{{c}^{2}}\]

Answer:

(a) \[15x{{y}^{2}}\times \text{ }17y{{z}^{2}}=\text{ }\left( 15\times 17 \right)\times x\times {{y}^{2}}\times y\times {{z}^{2}}\] \[=255x{{y}^{3}}{{z}^{2}}\]

(b) \[\text{ }5{{a}^{2}}bc\times 11ab\times 13ab{{c}^{2}}=\left( \text{ }5\times 11\times 13 \right){{a}^{2}}bc\times ab\times ab{{c}^{2}}\] \[=715{{a}^{4}}{{b}^{3}}{{c}^{3}}\]