Practicing Success
Practicing Success
CUET Preparation Today
If x - y = 25 and xy = 78, then what is the value of $x^2 + y^2 $ ? |
625 781 103 756 |
781 |
If x - y = 25 xy = 78, then what is the value of $x^2 + y^2 $ ( a - b )2 = $a^2 + b^2 $- 2ab ( 25 )2 = $x^2 + y^2 $ - 2(78) 625 = $x^2 + y^2 $ - 156 $x^2 + y^2 $ = 781 |
