(s+9)(s-7)=4

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Solution for (s+9)(s-7)=4 equation:


Simplifying
(s + 9)(s + -7) = 4

Reorder the terms:
(9 + s)(s + -7) = 4

Reorder the terms:
(9 + s)(-7 + s) = 4

Multiply (9 + s) * (-7 + s)
(9(-7 + s) + s(-7 + s)) = 4
((-7 * 9 + s * 9) + s(-7 + s)) = 4
((-63 + 9s) + s(-7 + s)) = 4
(-63 + 9s + (-7 * s + s * s)) = 4
(-63 + 9s + (-7s + s2)) = 4

Combine like terms: 9s + -7s = 2s
(-63 + 2s + s2) = 4

Solving
-63 + 2s + s2 = 4

Solving for variable 's'.

Reorder the terms:
-63 + -4 + 2s + s2 = 4 + -4

Combine like terms: -63 + -4 = -67
-67 + 2s + s2 = 4 + -4

Combine like terms: 4 + -4 = 0
-67 + 2s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '67' to each side of the equation.
-67 + 2s + 67 + s2 = 0 + 67

Reorder the terms:
-67 + 67 + 2s + s2 = 0 + 67

Combine like terms: -67 + 67 = 0
0 + 2s + s2 = 0 + 67
2s + s2 = 0 + 67

Combine like terms: 0 + 67 = 67
2s + s2 = 67

The s term is 2s.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2s + 1 + s2 = 67 + 1

Reorder the terms:
1 + 2s + s2 = 67 + 1

Combine like terms: 67 + 1 = 68
1 + 2s + s2 = 68

Factor a perfect square on the left side:
(s + 1)(s + 1) = 68

Calculate the square root of the right side: 8.246211251

Break this problem into two subproblems by setting 
(s + 1) equal to 8.246211251 and -8.246211251.

Subproblem 1

s + 1 = 8.246211251 Simplifying s + 1 = 8.246211251 Reorder the terms: 1 + s = 8.246211251 Solving 1 + s = 8.246211251 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + s = 8.246211251 + -1 Combine like terms: 1 + -1 = 0 0 + s = 8.246211251 + -1 s = 8.246211251 + -1 Combine like terms: 8.246211251 + -1 = 7.246211251 s = 7.246211251 Simplifying s = 7.246211251

Subproblem 2

s + 1 = -8.246211251 Simplifying s + 1 = -8.246211251 Reorder the terms: 1 + s = -8.246211251 Solving 1 + s = -8.246211251 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + s = -8.246211251 + -1 Combine like terms: 1 + -1 = 0 0 + s = -8.246211251 + -1 s = -8.246211251 + -1 Combine like terms: -8.246211251 + -1 = -9.246211251 s = -9.246211251 Simplifying s = -9.246211251

Solution

The solution to the problem is based on the solutions from the subproblems. s = {7.246211251, -9.246211251}

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