(4-u)(5u+7)=0

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Solution for (4-u)(5u+7)=0 equation:


Simplifying
(4 + -1u)(5u + 7) = 0

Reorder the terms:
(4 + -1u)(7 + 5u) = 0

Multiply (4 + -1u) * (7 + 5u)
(4(7 + 5u) + -1u * (7 + 5u)) = 0
((7 * 4 + 5u * 4) + -1u * (7 + 5u)) = 0
((28 + 20u) + -1u * (7 + 5u)) = 0
(28 + 20u + (7 * -1u + 5u * -1u)) = 0
(28 + 20u + (-7u + -5u2)) = 0

Combine like terms: 20u + -7u = 13u
(28 + 13u + -5u2) = 0

Solving
28 + 13u + -5u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(4 + -1u)(7 + 5u) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(7 + 5u)' equal to zero and attempt to solve: Simplifying 7 + 5u = 0 Solving 7 + 5u = 0 Move all terms containing u to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 5u = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 5u = 0 + -7 5u = 0 + -7 Combine like terms: 0 + -7 = -7 5u = -7 Divide each side by '5'. u = -1.4 Simplifying u = -1.4

Solution

u = {4, -1.4}

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