(u+3)(u-7)=

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Solution for (u+3)(u-7)= equation:


Simplifying
(u + 3)(u + -7) = 0

Reorder the terms:
(3 + u)(u + -7) = 0

Reorder the terms:
(3 + u)(-7 + u) = 0

Multiply (3 + u) * (-7 + u)
(3(-7 + u) + u(-7 + u)) = 0
((-7 * 3 + u * 3) + u(-7 + u)) = 0
((-21 + 3u) + u(-7 + u)) = 0
(-21 + 3u + (-7 * u + u * u)) = 0
(-21 + 3u + (-7u + u2)) = 0

Combine like terms: 3u + -7u = -4u
(-21 + -4u + u2) = 0

Solving
-21 + -4u + u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-3 + -1u)(7 + -1u) = 0

Subproblem 1

Set the factor '(-3 + -1u)' equal to zero and attempt to solve: Simplifying -3 + -1u = 0 Solving -3 + -1u = 0 Move all terms containing u to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1u = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1u = 0 + 3 -1u = 0 + 3 Combine like terms: 0 + 3 = 3 -1u = 3 Divide each side by '-1'. u = -3 Simplifying u = -3

Subproblem 2

Set the factor '(7 + -1u)' equal to zero and attempt to solve: Simplifying 7 + -1u = 0 Solving 7 + -1u = 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 + -1u = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1u = 0 + -7 -1u = 0 + -7 Combine like terms: 0 + -7 = -7 -1u = -7 Divide each side by '-1'. u = 7 Simplifying u = 7

Solution

u = {-3, 7}

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