3x^2+kx-5=(3x-1)(x+5)

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Solution for 3x^2+kx-5=(3x-1)(x+5) equation:


Simplifying
3x2 + kx + -5 = (3x + -1)(x + 5)

Reorder the terms:
-5 + kx + 3x2 = (3x + -1)(x + 5)

Reorder the terms:
-5 + kx + 3x2 = (-1 + 3x)(x + 5)

Reorder the terms:
-5 + kx + 3x2 = (-1 + 3x)(5 + x)

Multiply (-1 + 3x) * (5 + x)
-5 + kx + 3x2 = (-1(5 + x) + 3x * (5 + x))
-5 + kx + 3x2 = ((5 * -1 + x * -1) + 3x * (5 + x))
-5 + kx + 3x2 = ((-5 + -1x) + 3x * (5 + x))
-5 + kx + 3x2 = (-5 + -1x + (5 * 3x + x * 3x))
-5 + kx + 3x2 = (-5 + -1x + (15x + 3x2))

Combine like terms: -1x + 15x = 14x
-5 + kx + 3x2 = (-5 + 14x + 3x2)

Add '5' to each side of the equation.
-5 + kx + 5 + 3x2 = -5 + 14x + 5 + 3x2

Reorder the terms:
-5 + 5 + kx + 3x2 = -5 + 14x + 5 + 3x2

Combine like terms: -5 + 5 = 0
0 + kx + 3x2 = -5 + 14x + 5 + 3x2
kx + 3x2 = -5 + 14x + 5 + 3x2

Reorder the terms:
kx + 3x2 = -5 + 5 + 14x + 3x2

Combine like terms: -5 + 5 = 0
kx + 3x2 = 0 + 14x + 3x2
kx + 3x2 = 14x + 3x2

Add '-3x2' to each side of the equation.
kx + 3x2 + -3x2 = 14x + 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
kx + 0 = 14x + 3x2 + -3x2
kx = 14x + 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
kx = 14x + 0
kx = 14x

Solving
kx = 14x

Solving for variable 'k'.

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

Divide each side by 'x'.
k = 14

Simplifying
k = 14

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