Question

9x⁴- 148 x² + 64 = 0
find x = ?​

Answer 1

Answer:

x=+-4,+-2/3

Step-by-step explanation:

9x4-148x2+64=0

9x4-144x2-4x2+64=0

9x2(x2-16)-4(x2-16)=0

(9x2-4)(x2-16)=0

x=+-4,+-2/3

Answer 2

Answer:

Let y=x²

The given equation reduces to a quadratic equation in ‘y’ as

9y²-148y+64=0

=> y=148+-√(-148)²-4(9)(64)

______________________

2.9

=148+-√19600

____________

18

=148+-140

________

18

=16 or 4

_

9

=>x²=16 or x²=4

_

9

=>x=+-4 or x=+-2

_

3