Saved Bookmarks
| 1. |
If a+b=7 and ab=17 find a^2-ab+b^2 |
|
Answer» -2 Step-by-step EXPLANATION: a+b=7 by USING IDENTITY, (a+b)^2=7^2 a^2 +2ab+b^2=49 since ab=17, a^2+2*17+b^2=49 a^2+b^2=49-34 a^2+b^2=15 therefore, a^2-ab+b^2=15-17 = -2 |
|