Question

8. If a and b are respectively the sum and product of coefficients of terms in the expression
x2 + y2 + z2 - xy - yz – zx , then a + 2b =
(a) o
(b) 2
(c) - 2
(d) -1
​

Answer 1

a = sum of coefficients = 1+1+1-1-1-1=0

b = Product of coefficients = 1×1×1×(-1)×(-1)×(-1)= -1

Now Substitute the value of a and b in a+2b, we get

0 + 2(-1)= -2

(c) -2 is correct

Answer 2

Answer:

option C -2

Step-by-step explanation:

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