Question

hi guys
plz answer and explain 5th and 6th Question
IX Maths
Related to Ncert
UNNECESSARY Answer will be DELETED
BEST answer will be mark as BRAINLIST ​

Answer 1

Answer:

Step-by-step explanation:

Assuming that 2x-1 will exactly divide 4x³+4x²-x-1. If it does so, then x=1/2 should satisfy the equation 4x³+4x²-x-1 leaving the remainder 0.

Putting x=1/2 in 4x³+4x²-x-1

=4/8+4/4-1/2-1

=1/2+1-1/2-1

=0

Therefor our assumption was true.

x-1 exactly divides x³-ax²-13x+15, hence x=1 should satisfy the equation    x³-ax²-13x+15 leaving no remainder.

Therefor Putting x=1 in x³-ax²-13x+15

1-a-13+15=0

a=3  [Answer]