6
II – + U
7 If a + b = 4 and ab = -12, find (1) a – b (ii) a²-b²​

1 thought on “6<br />II – + U<br />7 If a + b = 4 and ab = -12, find (1) a – b (ii) a²-b²​”

1. Step-by-step explanation:

   a=4-b

   =(4-b)(b)=-12

   =b(4−b)=−12

   =4b−b²=−12

   =4b−b²+12=0

   =b²−4b−12=0

   =(b−6)(b+2)=0

   =b=6

   Reply