(1-7x)(1+9x)=

Solution for (1-7x)(1+9x)= equation:

Simplifying
(1 + -7x)(1 + 9x) = 0

Multiply (1 + -7x) * (1 + 9x)
(1(1 + 9x) + -7x * (1 + 9x)) = 0
((1 * 1 + 9x * 1) + -7x * (1 + 9x)) = 0
((1 + 9x) + -7x * (1 + 9x)) = 0
(1 + 9x + (1 * -7x + 9x * -7x)) = 0
(1 + 9x + (-7x + -63x2)) = 0

Combine like terms: 9x + -7x = 2x
(1 + 2x + -63x2) = 0

Solving
1 + 2x + -63x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(1 + -7x)(1 + 9x) = 0

Subproblem 1
Set the factor '(1 + -7x)' equal to zero and attempt to solve:

Simplifying
1 + -7x = 0

Solving
1 + -7x = 0

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

Add '-1' to each side of the equation.
1 + -1 + -7x = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -7x = 0 + -1
-7x = 0 + -1

Combine like terms: 0 + -1 = -1
-7x = -1

Divide each side by '-7'.
x = 0.1428571429

Simplifying
x = 0.1428571429
Subproblem 2
Set the factor '(1 + 9x)' equal to zero and attempt to solve:

Simplifying
1 + 9x = 0

Solving
1 + 9x = 0

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

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

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

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

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

Simplifying
x = -0.1111111111
Solution
x = {0.1428571429, -0.1111111111}