Question

Expand it please
(2/7z-3/5x)2

Answer 1

Answer:
`\bold{(4)/(49)z^2-(12)/(35)xz+(9)/(25)x^2}`

Explanation:

`\bigg((2)/(7)z-(3)/(5)x\bigg)\bigg((2)/(7)z-(3)/(5)x\bigg)\\\\\\=(2)/(7)z\bigg((2)/(7)z-(3)/(5)x\bigg)-(3)/(5)x\bigg((2)/(7)z-(3)/(5)x\bigg)\\\\\\=(4)/(49)z^2-(6)/(35)xz-(6)/(35)xz+(9)/(25)x^2\\\\\\=(4)/(49)z^2-(12)/(35)xz+(9)/(25)x^2`