(3u-2)(2u+1)-5u(u+3)=103

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Solution for (3u-2)(2u+1)-5u(u+3)=103 equation:


Simplifying
(3u + -2)(2u + 1) + -5u(u + 3) = 103

Reorder the terms:
(-2 + 3u)(2u + 1) + -5u(u + 3) = 103

Reorder the terms:
(-2 + 3u)(1 + 2u) + -5u(u + 3) = 103

Multiply (-2 + 3u) * (1 + 2u)
(-2(1 + 2u) + 3u * (1 + 2u)) + -5u(u + 3) = 103
((1 * -2 + 2u * -2) + 3u * (1 + 2u)) + -5u(u + 3) = 103
((-2 + -4u) + 3u * (1 + 2u)) + -5u(u + 3) = 103
(-2 + -4u + (1 * 3u + 2u * 3u)) + -5u(u + 3) = 103
(-2 + -4u + (3u + 6u2)) + -5u(u + 3) = 103

Combine like terms: -4u + 3u = -1u
(-2 + -1u + 6u2) + -5u(u + 3) = 103

Reorder the terms:
-2 + -1u + 6u2 + -5u(3 + u) = 103
-2 + -1u + 6u2 + (3 * -5u + u * -5u) = 103
-2 + -1u + 6u2 + (-15u + -5u2) = 103

Reorder the terms:
-2 + -1u + -15u + 6u2 + -5u2 = 103

Combine like terms: -1u + -15u = -16u
-2 + -16u + 6u2 + -5u2 = 103

Combine like terms: 6u2 + -5u2 = 1u2
-2 + -16u + 1u2 = 103

Solving
-2 + -16u + 1u2 = 103

Solving for variable 'u'.

Reorder the terms:
-2 + -103 + -16u + 1u2 = 103 + -103

Combine like terms: -2 + -103 = -105
-105 + -16u + 1u2 = 103 + -103

Combine like terms: 103 + -103 = 0
-105 + -16u + 1u2 = 0

Factor a trinomial.
(-5 + -1u)(21 + -1u) = 0

Subproblem 1

Set the factor '(-5 + -1u)' equal to zero and attempt to solve: Simplifying -5 + -1u = 0 Solving -5 + -1u = 0 Move all terms containing u to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1u = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1u = 0 + 5 -1u = 0 + 5 Combine like terms: 0 + 5 = 5 -1u = 5 Divide each side by '-1'. u = -5 Simplifying u = -5

Subproblem 2

Set the factor '(21 + -1u)' equal to zero and attempt to solve: Simplifying 21 + -1u = 0 Solving 21 + -1u = 0 Move all terms containing u to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -1u = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1u = 0 + -21 -1u = 0 + -21 Combine like terms: 0 + -21 = -21 -1u = -21 Divide each side by '-1'. u = 21 Simplifying u = 21

Solution

u = {-5, 21}

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