If a + b + c = 7 and , then what is the value of (ab + bc + ca)?
A8
B7
C6
D9
If a + b + c = 7 and , then what is the value of (ab + bc + ca)?
A8
B7
C6
D9
Related Questions:
f (a + b + c) = 12, and (a2 + b2 + c2) = 50, find the value of (a3 + b3 + c3 - 3abc)
If , find the value of .
If a + b = 10 and of ab = 9, then the value of a3 + b3 is: