Make a change of variable, x = Py, that transforms the given quadratic form into a quadratic form with no cross-product term. Give P and the new quadratic form.Q(x) = 13
+ 12
+ 5
+ 20x1x2 + 8x1x3 + 12x2x3
A.
P = 
; 5
+ 2
+ 
B.
P = 
; 25
+ 4
+ 
C.
P = 
; 25
+ 4
+ 
D.
P = 
; 
+ 4
+ 25
Answer: B
Mathematics
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a - 
= -5
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