Answer:
u = x²
Step-by-step explanation:
4x⁴ − 21x² + 20 = 0
Substitute u = x² to turn the equation into a quadratic.
4u² − 21u + 20 = 0
You can solve by factoring.
(4u − 5) (u − 4) = 0
u = 5/4 or 4
x² = 5/4 or 4
x = ±½√5 or ±2
Answer:
The correct answer would be -9 7/12
You have to multiply the numbers together.
Answer:
0.0045%
Step-by-step explanation:
0.0045 is not a fraction so it is a decimal already.
Answer:
144/100=1.44
Step-by-step explanation:
it is done