Answer:
4u²
Step-by-step explanation:

Common factors cancel from numerator and denominator. The one factor that might make the expression undefined is given as non-zero, so no additional restrictions apply.
Answer:
y=x^2 is not a linear function
Step-by-step explanation:
Answer:
1.No- that just means that the numbers on that side are smaller
Step-by-step explanation:
Answer:
(x + 9)² = 36
Step-by-step explanation:
Given
x² + 18x + 57 = 12 ( subtract 57 from both sides )
x² + 18x = - 45
To complete the square
add ( half the coefficient of the x- term)² to both sides
x² + 2(9)x + 81 = - 45 + 81
(x + 9)² = 36