a^2+3a-28=(a-4)(a+[1])

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Solution for a^2+3a-28=(a-4)(a+[1]) equation:


Simplifying
a2 + 3a + -28 = (a + -4)(a + [1])

Reorder the terms:
-28 + 3a + a2 = (a + -4)(a + [1])

Reorder the terms:
-28 + 3a + a2 = (-4 + a)(a + [1])
-28 + 3a + a2 = (-4 + a)(a + 1)

Reorder the terms:
-28 + 3a + a2 = (-4 + a)(1 + a)

Multiply (-4 + a) * (1 + a)
-28 + 3a + a2 = (-4(1 + a) + a(1 + a))
-28 + 3a + a2 = ((1 * -4 + a * -4) + a(1 + a))
-28 + 3a + a2 = ((-4 + -4a) + a(1 + a))
-28 + 3a + a2 = (-4 + -4a + (1 * a + a * a))
-28 + 3a + a2 = (-4 + -4a + (1a + a2))

Combine like terms: -4a + 1a = -3a
-28 + 3a + a2 = (-4 + -3a + a2)

Add '-1a2' to each side of the equation.
-28 + 3a + a2 + -1a2 = -4 + -3a + a2 + -1a2

Combine like terms: a2 + -1a2 = 0
-28 + 3a + 0 = -4 + -3a + a2 + -1a2
-28 + 3a = -4 + -3a + a2 + -1a2

Combine like terms: a2 + -1a2 = 0
-28 + 3a = -4 + -3a + 0
-28 + 3a = -4 + -3a

Solving
-28 + 3a = -4 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
-28 + 3a + 3a = -4 + -3a + 3a

Combine like terms: 3a + 3a = 6a
-28 + 6a = -4 + -3a + 3a

Combine like terms: -3a + 3a = 0
-28 + 6a = -4 + 0
-28 + 6a = -4

Add '28' to each side of the equation.
-28 + 28 + 6a = -4 + 28

Combine like terms: -28 + 28 = 0
0 + 6a = -4 + 28
6a = -4 + 28

Combine like terms: -4 + 28 = 24
6a = 24

Divide each side by '6'.
a = 4

Simplifying
a = 4

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