May I ask what grade is this?
Answer:

Step-by-step explanation:
Given
x² + x
To complete the square
add ( half the coefficient of the x- term )² to x² + x
x² + 2(
)x + (
)² = x² + x + 
= (x +
)² ← perfect square
Answer:
1) 18a^11
2) 7b^5
3) 16c^12
4) 3/2d^2
Step-by-step explanation:
i hope this helped
0.04, 0.258, 0.4, 0.52, 1.25