Question

Expand using suitable identities: (3xy - 4z)²​

Answer 1

Answer:

$(3xy - 4z)^2 = 9x^2y^2 -24xyz + 16z^2$

Step-by-step explanation:

Suitable identities = $(a -b)^2 = a^2 - 2ab + b^2$

$(a-b)^2$ = (first value)^2 - 2 (first value) (second value) + (second value)^2

$(3xy - 4z)^2 = (3xy)^2 - 2 (3xy)(4z) + (4z)^2\\= 9x^2y^2 -6xy(4z) + 16z^2\\= 9x^2y^2 -24xyz + 16z^2$