The Base64 encoded representation of the text "Solve a quadratic equation" is as follows:
```
SzdWJ0dXJuIHVuaXF1ZSBhbmQgcmVhbGx5IGZvdWxlIGNpcmlnaHRzLgoqS25vdyBkZXNpYmxlZCBwYXVsIFIuIEVsZW1lbnQuCiAqIHN0c29tZSBjb252ZXJpbmc=
```
The decoded text is "Solve a quadratic equation".