Question

using the standard formula expand (2x/9+y/7-5z/3)²​

Answer 1

Step-by-step explanation:

$(a + b + ) ^{2} = {a}^{2} + { b }^{2} + {c}^{2} + 2ab + 2bc + 2ca$

$( \frac{2x}{9} + \frac{y}{7} - \frac{5z}{3} ) ^{2}$

$= \frac{4 {x}^{2} }{81} + \frac{ {y}^{2} }{49} + \frac{ 25 {z}^{2} }{9} + \frac{4xy}{63} - \frac{10yz}{21} - \frac{20xz}{27}$