(3a^2+5a-4)-(3a^2-4a+1)=4a+15

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Solution for (3a^2+5a-4)-(3a^2-4a+1)=4a+15 equation:


Simplifying
(3a2 + 5a + -4) + -1(3a2 + -4a + 1) = 4a + 15

Reorder the terms:
(-4 + 5a + 3a2) + -1(3a2 + -4a + 1) = 4a + 15

Remove parenthesis around (-4 + 5a + 3a2)
-4 + 5a + 3a2 + -1(3a2 + -4a + 1) = 4a + 15

Reorder the terms:
-4 + 5a + 3a2 + -1(1 + -4a + 3a2) = 4a + 15
-4 + 5a + 3a2 + (1 * -1 + -4a * -1 + 3a2 * -1) = 4a + 15
-4 + 5a + 3a2 + (-1 + 4a + -3a2) = 4a + 15

Reorder the terms:
-4 + -1 + 5a + 4a + 3a2 + -3a2 = 4a + 15

Combine like terms: -4 + -1 = -5
-5 + 5a + 4a + 3a2 + -3a2 = 4a + 15

Combine like terms: 5a + 4a = 9a
-5 + 9a + 3a2 + -3a2 = 4a + 15

Combine like terms: 3a2 + -3a2 = 0
-5 + 9a + 0 = 4a + 15
-5 + 9a = 4a + 15

Reorder the terms:
-5 + 9a = 15 + 4a

Solving
-5 + 9a = 15 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
-5 + 9a + -4a = 15 + 4a + -4a

Combine like terms: 9a + -4a = 5a
-5 + 5a = 15 + 4a + -4a

Combine like terms: 4a + -4a = 0
-5 + 5a = 15 + 0
-5 + 5a = 15

Add '5' to each side of the equation.
-5 + 5 + 5a = 15 + 5

Combine like terms: -5 + 5 = 0
0 + 5a = 15 + 5
5a = 15 + 5

Combine like terms: 15 + 5 = 20
5a = 20

Divide each side by '5'.
a = 4

Simplifying
a = 4

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