Hey guys.
As per title, got a test tomorrow, and friend sent me a question asking how to do it. So I attempted it and got the same error as him. My working is here; I thought I was doing it right but get a negative under the square root.
The question is:
Provided you know two roots are reciprocals of each other of the polynomial; 3xcubed+ xsquared - kx + 6=0
Find k.
Spot my error? Haha
THAANKS IN ADVANCE!!
![20131215_203855.jpg](/data/attachments/22/22469-ecd7cc34199c5bfda0d833529e40b505.jpg)
![20131215_203831.jpg](/data/attachments/22/22470-03fa4221c4f37b37d9563dacb2b7bab4.jpg)
As per title, got a test tomorrow, and friend sent me a question asking how to do it. So I attempted it and got the same error as him. My working is here; I thought I was doing it right but get a negative under the square root.
The question is:
Provided you know two roots are reciprocals of each other of the polynomial; 3xcubed+ xsquared - kx + 6=0
Find k.
Spot my error? Haha
THAANKS IN ADVANCE!!
![20131215_203855.jpg](/data/attachments/22/22469-ecd7cc34199c5bfda0d833529e40b505.jpg)
![20131215_203831.jpg](/data/attachments/22/22470-03fa4221c4f37b37d9563dacb2b7bab4.jpg)