(2w+5)w-42=0

Solution for (2w+5)w-42=0 equation:

Simplifying
(2w + 5) * w + -42 = 0

Reorder the terms:
(5 + 2w) * w + -42 = 0

Reorder the terms for easier multiplication:
w(5 + 2w) + -42 = 0
(5 * w + 2w * w) + -42 = 0
(5w + 2w2) + -42 = 0

Reorder the terms:
-42 + 5w + 2w2 = 0

Solving
-42 + 5w + 2w2 = 0

Solving for variable 'w'.

Factor a trinomial.
(-6 + -1w)(7 + -2w) = 0

Subproblem 1
Set the factor '(-6 + -1w)' equal to zero and attempt to solve:

Simplifying
-6 + -1w = 0

Solving
-6 + -1w = 0

Move all terms containing w to the left, all other terms to the right.

Add '6' to each side of the equation.
-6 + 6 + -1w = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1w = 0 + 6
-1w = 0 + 6

Combine like terms: 0 + 6 = 6
-1w = 6

Divide each side by '-1'.
w = -6

Simplifying
w = -6
Subproblem 2
Set the factor '(7 + -2w)' equal to zero and attempt to solve:

Simplifying
7 + -2w = 0

Solving
7 + -2w = 0

Move all terms containing w to the left, all other terms to the right.

Add '-7' to each side of the equation.
7 + -7 + -2w = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -2w = 0 + -7
-2w = 0 + -7

Combine like terms: 0 + -7 = -7
-2w = -7

Divide each side by '-2'.
w = 3.5

Simplifying
w = 3.5
Solution
w = {-6, 3.5}