Factor by grouping.
0 = (x^3 +4x^2) +(9x +36) = x^2(x+4) +9(x+4) = (x^2+9)(x+4)
The first factor is the difference of squares (in complex numbers), so the form for factoring that can be used:
a^2 - b^2 = (a -b)(a +b)
Here, a=x, b=3i.
Then the factorization in complex numbers is
0 = (x -3i)(x +3i)(x +4)
Solutions are the values of x that make these factors be zero.
x = -4, -3i, 3i
Answer:12
Step-by-step explanation:
Answer:
d=1／2
Step-by-step explanation:
Answer:
8.8 or 9 laps
Step-by-step explanation:
2 miles = 3520 yards
3520 / 400 = 8.8
But if you round it up, it's 9.
Hope that helps
Answer D Would be probably the best answer
