(r-4)(r+1)+(r-4)(r+6)=0

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Solution for (r-4)(r+1)+(r-4)(r+6)=0 equation:


Simplifying
(r + -4)(r + 1) + (r + -4)(r + 6) = 0

Reorder the terms:
(-4 + r)(r + 1) + (r + -4)(r + 6) = 0

Reorder the terms:
(-4 + r)(1 + r) + (r + -4)(r + 6) = 0

Multiply (-4 + r) * (1 + r)
(-4(1 + r) + r(1 + r)) + (r + -4)(r + 6) = 0
((1 * -4 + r * -4) + r(1 + r)) + (r + -4)(r + 6) = 0
((-4 + -4r) + r(1 + r)) + (r + -4)(r + 6) = 0
(-4 + -4r + (1 * r + r * r)) + (r + -4)(r + 6) = 0
(-4 + -4r + (1r + r2)) + (r + -4)(r + 6) = 0

Combine like terms: -4r + 1r = -3r
(-4 + -3r + r2) + (r + -4)(r + 6) = 0

Reorder the terms:
-4 + -3r + r2 + (-4 + r)(r + 6) = 0

Reorder the terms:
-4 + -3r + r2 + (-4 + r)(6 + r) = 0

Multiply (-4 + r) * (6 + r)
-4 + -3r + r2 + (-4(6 + r) + r(6 + r)) = 0
-4 + -3r + r2 + ((6 * -4 + r * -4) + r(6 + r)) = 0
-4 + -3r + r2 + ((-24 + -4r) + r(6 + r)) = 0
-4 + -3r + r2 + (-24 + -4r + (6 * r + r * r)) = 0
-4 + -3r + r2 + (-24 + -4r + (6r + r2)) = 0

Combine like terms: -4r + 6r = 2r
-4 + -3r + r2 + (-24 + 2r + r2) = 0

Reorder the terms:
-4 + -24 + -3r + 2r + r2 + r2 = 0

Combine like terms: -4 + -24 = -28
-28 + -3r + 2r + r2 + r2 = 0

Combine like terms: -3r + 2r = -1r
-28 + -1r + r2 + r2 = 0

Combine like terms: r2 + r2 = 2r2
-28 + -1r + 2r2 = 0

Solving
-28 + -1r + 2r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(-7 + -2r)(4 + -1r) = 0

Subproblem 1

Set the factor '(-7 + -2r)' equal to zero and attempt to solve: Simplifying -7 + -2r = 0 Solving -7 + -2r = 0 Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -2r = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -2r = 0 + 7 -2r = 0 + 7 Combine like terms: 0 + 7 = 7 -2r = 7 Divide each side by '-2'. r = -3.5 Simplifying r = -3.5

Subproblem 2

Set the factor '(4 + -1r)' equal to zero and attempt to solve: Simplifying 4 + -1r = 0 Solving 4 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1r = 0 + -4 -1r = 0 + -4 Combine like terms: 0 + -4 = -4 -1r = -4 Divide each side by '-1'. r = 4 Simplifying r = 4

Solution

r = {-3.5, 4}

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