a(a-7)+3(2a+5)=

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Solution for a(a-7)+3(2a+5)= equation:


Simplifying
a(a + -7) + 3(2a + 5) = 0

Reorder the terms:
a(-7 + a) + 3(2a + 5) = 0
(-7 * a + a * a) + 3(2a + 5) = 0
(-7a + a2) + 3(2a + 5) = 0

Reorder the terms:
-7a + a2 + 3(5 + 2a) = 0
-7a + a2 + (5 * 3 + 2a * 3) = 0
-7a + a2 + (15 + 6a) = 0

Reorder the terms:
15 + -7a + 6a + a2 = 0

Combine like terms: -7a + 6a = -1a
15 + -1a + a2 = 0

Solving
15 + -1a + a2 = 0

Solving for variable 'a'.

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + -1a + -15 + a2 = 0 + -15

Reorder the terms:
15 + -15 + -1a + a2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -1a + a2 = 0 + -15
-1a + a2 = 0 + -15

Combine like terms: 0 + -15 = -15
-1a + a2 = -15

The a term is -1a.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1a + 0.25 + a2 = -15 + 0.25

Reorder the terms:
0.25 + -1a + a2 = -15 + 0.25

Combine like terms: -15 + 0.25 = -14.75
0.25 + -1a + a2 = -14.75

Factor a perfect square on the left side:
(a + -0.5)(a + -0.5) = -14.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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