Question

What is the coefficient of x² in the expression ax+b ?

1:b

2:(a+b)

3:a

4:0



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Answer 1

Answer:

0

Step-by-step explanation:

there there is no x square in the expression (ax+b)

:. the coefficient of x square is zero

0 is the answer

Answer 2

Answer:

Coefficient of x

2

=

15

C

2

×9−3a(

15

C

1

)+=0

⇒−45a+b+

15

C

2

×9=0 ...(i)

Also, −27×

15

C

3

+9a×

15

C

2

−3b×

15

C

1

=0

⇒9×

15

C

2

a−45b−27×

15

C

3

=0

⇒21a−b−273=0 ...(ii)

(i) + (ii)

−24a+672=0

⇒a=28

So, b=315