Saved Bookmarks
| 1. |
2. If 4x2 + 20x + r = (2x + s)2 for all values of x,what is the value of r-s? |
|
Answer» just EXPAND and EQUATE coefficients 4x^2+20x+r = 4x^2+4sx+s^2 4s=20 s=5 r = s^2 = 25 r-s = 20 |
|