If [ 3x −1 y − x 4 ] = [ 3 −1 −3 4 ] then what is y?
Answers
Answer:
Answer
Correct option is
A
0
(3x−1)
4
=a
4
x
4
+a
3
x
3
+a
2
x
2
+a
1
x+a
0
=>(3x−1)
2
(3x−1)
2
=a
4
x
4
+a
3
x
3
+a
2
x
2
+a
1
x+a
0
=>(9x
2
−6x+1)(9x
2
−6x+1)=a
4
x
4
+a
3
x
3
+a
2
x
2
+a
1
x+a
0
=>(81x
4
−54x
3
+9x
2
−54x
3
−6x+9x
2
−6x+1)=a
4
x
4
+a
3
x
3
+a
2
x
2
+a
1
x+a
0
=>(81x
4
−108x
3
+18x
2
−12x+1)=a
4
x
4
+a
3
x
3
+a
2
x
2
+a
1
x+a
0
Thus, a
4
=81
a
3
=−108
a
2
=18
a
1
=−12
a
0
=1
Now,
a
4
+3a
3
+9a
2
+27a
1
+81a
0
=81+3(−108)+9(18)+27(−12)+81(1)
=81−324+162−324+81
=0
Step-by-step explanation: