8t=0.3t*t+0.1t+4.2

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Solution for 8t=0.3t*t+0.1t+4.2 equation:


Simplifying
8t = 0.3t * t + 0.1t + 4.2

Multiply t * t
8t = 0.3t2 + 0.1t + 4.2

Reorder the terms:
8t = 4.2 + 0.1t + 0.3t2

Solving
8t = 4.2 + 0.1t + 0.3t2

Solving for variable 't'.

Reorder the terms:
-4.2 + 8t + -0.1t + -0.3t2 = 4.2 + 0.1t + 0.3t2 + -4.2 + -0.1t + -0.3t2

Combine like terms: 8t + -0.1t = 7.9t
-4.2 + 7.9t + -0.3t2 = 4.2 + 0.1t + 0.3t2 + -4.2 + -0.1t + -0.3t2

Reorder the terms:
-4.2 + 7.9t + -0.3t2 = 4.2 + -4.2 + 0.1t + -0.1t + 0.3t2 + -0.3t2

Combine like terms: 4.2 + -4.2 = 0.0
-4.2 + 7.9t + -0.3t2 = 0.0 + 0.1t + -0.1t + 0.3t2 + -0.3t2
-4.2 + 7.9t + -0.3t2 = 0.1t + -0.1t + 0.3t2 + -0.3t2

Combine like terms: 0.1t + -0.1t = 0.0
-4.2 + 7.9t + -0.3t2 = 0.0 + 0.3t2 + -0.3t2
-4.2 + 7.9t + -0.3t2 = 0.3t2 + -0.3t2

Combine like terms: 0.3t2 + -0.3t2 = 0.0
-4.2 + 7.9t + -0.3t2 = 0.0

Begin completing the square.  Divide all terms by
-0.3 the coefficient of the squared term: 

Divide each side by '-0.3'.
14 + -26.33333333t + t2 = 0

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + -26.33333333t + -14 + t2 = 0 + -14

Reorder the terms:
14 + -14 + -26.33333333t + t2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -26.33333333t + t2 = 0 + -14
-26.33333333t + t2 = 0 + -14

Combine like terms: 0 + -14 = -14
-26.33333333t + t2 = -14

The t term is -26.33333333t.  Take half its coefficient (-13.16666667).
Square it (173.3611112) and add it to both sides.

Add '173.3611112' to each side of the equation.
-26.33333333t + 173.3611112 + t2 = -14 + 173.3611112

Reorder the terms:
173.3611112 + -26.33333333t + t2 = -14 + 173.3611112

Combine like terms: -14 + 173.3611112 = 159.3611112
173.3611112 + -26.33333333t + t2 = 159.3611112

Factor a perfect square on the left side:
(t + -13.16666667)(t + -13.16666667) = 159.3611112

Calculate the square root of the right side: 12.623831083

Break this problem into two subproblems by setting 
(t + -13.16666667) equal to 12.623831083 and -12.623831083.

Subproblem 1

t + -13.16666667 = 12.623831083 Simplifying t + -13.16666667 = 12.623831083 Reorder the terms: -13.16666667 + t = 12.623831083 Solving -13.16666667 + t = 12.623831083 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '13.16666667' to each side of the equation. -13.16666667 + 13.16666667 + t = 12.623831083 + 13.16666667 Combine like terms: -13.16666667 + 13.16666667 = 0.00000000 0.00000000 + t = 12.623831083 + 13.16666667 t = 12.623831083 + 13.16666667 Combine like terms: 12.623831083 + 13.16666667 = 25.790497753 t = 25.790497753 Simplifying t = 25.790497753

Subproblem 2

t + -13.16666667 = -12.623831083 Simplifying t + -13.16666667 = -12.623831083 Reorder the terms: -13.16666667 + t = -12.623831083 Solving -13.16666667 + t = -12.623831083 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '13.16666667' to each side of the equation. -13.16666667 + 13.16666667 + t = -12.623831083 + 13.16666667 Combine like terms: -13.16666667 + 13.16666667 = 0.00000000 0.00000000 + t = -12.623831083 + 13.16666667 t = -12.623831083 + 13.16666667 Combine like terms: -12.623831083 + 13.16666667 = 0.542835587 t = 0.542835587 Simplifying t = 0.542835587

Solution

The solution to the problem is based on the solutions from the subproblems. t = {25.790497753, 0.542835587}

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