Question

What is the coefficient of x in the expression 1 + x + xz? *

1 point

a) z

(b) 1 + z

(c) 1

(d) 1 + x.

​

Answer 1

Answer:

• Step-by-step explanation:If 3/5 of a group of children were girls . find the fraction of boys in a group of children

Answer 2

2

a(y+z)=x,b(z+x)=y,c(x+y)=z

⇒a=

y+z

x

;b=

z+x

y

;c=

x+y

z

Now, (1+a)

−1

+(1+b)

−1

+(1+c)

−1

=

1+a

1

+

1+b

1

+

1+c

1

=

1+

y+z

x

1

+

1+

z+x

y

1

+

1+

x+y

z

1

=

y+z+x

y+z

+

z+x+y

z+x

+

x+y+z

x+y

=

y+z+x

2(x+y+z)

=2