Answer:
Step-by-step explanation:
Answer:
Step-by-step explanation:
9x⁴ – 2x² – 7 = 0
Let's say that u = x²:
9u² – 2u – 7 = 0
Factor:
(u – 1) (9u + 7) = 0
u = 1, -7/9
Since u = x²:
x² = 1, -7/9
x = ±1, ±i √(7/9)
Solutions
1hr = 60 min
180 ÷ 60 = 3
<span>180 min = 3 hrs </span>
0.36 I hope this was what you wanted
