a(a+7)-3(a-7)=

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


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

Reorder the terms:
a(7 + a) + -3(a + -7) = 0
(7 * a + a * a) + -3(a + -7) = 0
(7a + a2) + -3(a + -7) = 0

Reorder the terms:
7a + a2 + -3(-7 + a) = 0
7a + a2 + (-7 * -3 + a * -3) = 0
7a + a2 + (21 + -3a) = 0

Reorder the terms:
21 + 7a + -3a + a2 = 0

Combine like terms: 7a + -3a = 4a
21 + 4a + a2 = 0

Solving
21 + 4a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '-21' to each side of the equation.
21 + 4a + -21 + a2 = 0 + -21

Reorder the terms:
21 + -21 + 4a + a2 = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 4a + a2 = 0 + -21
4a + a2 = 0 + -21

Combine like terms: 0 + -21 = -21
4a + a2 = -21

The a term is 4a.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4a + 4 + a2 = -21 + 4

Reorder the terms:
4 + 4a + a2 = -21 + 4

Combine like terms: -21 + 4 = -17
4 + 4a + a2 = -17

Factor a perfect square on the left side:
(a + 2)(a + 2) = -17

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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