(1+y)(1+9y)=

Solution for (1+y)(1+9y)= equation:

Simplifying
(1 + y)(1 + 9y) = 0

Multiply (1 + y) * (1 + 9y)
(1(1 + 9y) + y(1 + 9y)) = 0
((1 * 1 + 9y * 1) + y(1 + 9y)) = 0
((1 + 9y) + y(1 + 9y)) = 0
(1 + 9y + (1 * y + 9y * y)) = 0
(1 + 9y + (1y + 9y2)) = 0

Combine like terms: 9y + 1y = 10y
(1 + 10y + 9y2) = 0

Solving
1 + 10y + 9y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(1 + y)(1 + 9y) = 0

Subproblem 1
Set the factor '(1 + y)' equal to zero and attempt to solve:

Simplifying
1 + y = 0

Solving
1 + y = 0

Move all terms containing y to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + y = 0 + -1

Combine like terms: 1 + -1 = 0
0 + y = 0 + -1
y = 0 + -1

Combine like terms: 0 + -1 = -1
y = -1

Simplifying
y = -1
Subproblem 2
Set the factor '(1 + 9y)' equal to zero and attempt to solve:

Simplifying
1 + 9y = 0

Solving
1 + 9y = 0

Move all terms containing y to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + 9y = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 9y = 0 + -1
9y = 0 + -1

Combine like terms: 0 + -1 = -1
9y = -1

Divide each side by '9'.
y = -0.1111111111

Simplifying
y = -0.1111111111
Solution
y = {-1, -0.1111111111}