Question

pls solve my camera is not working that why i wrote it ​

Answer 1

$(x - y)^{2} = {x}^{2} + {y}^{2} - 2xy \\ {( \frac{a}{2} - \frac{b}{7} )}^{2} = { \frac{a}{4} }^{2} + { \frac{b}{49} }^{2} - \frac{ab}{7}$

hope it helps