10t^2-.25t^4=36

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Solution for 10t^2-.25t^4=36 equation:


Simplifying
10t2 + -0.25t4 = 36

Solving
10t2 + -0.25t4 = 36

Solving for variable 't'.

Reorder the terms:
-36 + 10t2 + -0.25t4 = 36 + -36

Combine like terms: 36 + -36 = 0
-36 + 10t2 + -0.25t4 = 0

Begin completing the square.  Divide all terms by
-0.25 the coefficient of the squared term: 

Divide each side by '-0.25'.
144 + -40t2 + t4 = 0

Move the constant term to the right:

Add '-144' to each side of the equation.
144 + -40t2 + -144 + t4 = 0 + -144

Reorder the terms:
144 + -144 + -40t2 + t4 = 0 + -144

Combine like terms: 144 + -144 = 0
0 + -40t2 + t4 = 0 + -144
-40t2 + t4 = 0 + -144

Combine like terms: 0 + -144 = -144
-40t2 + t4 = -144

The t term is -40t2.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40t2 + 400 + t4 = -144 + 400

Reorder the terms:
400 + -40t2 + t4 = -144 + 400

Combine like terms: -144 + 400 = 256
400 + -40t2 + t4 = 256

Factor a perfect square on the left side:
(t2 + -20)(t2 + -20) = 256

Calculate the square root of the right side: 16

Break this problem into two subproblems by setting 
(t2 + -20) equal to 16 and -16.

Subproblem 1

t2 + -20 = 16 Simplifying t2 + -20 = 16 Reorder the terms: -20 + t2 = 16 Solving -20 + t2 = 16 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + t2 = 16 + 20 Combine like terms: -20 + 20 = 0 0 + t2 = 16 + 20 t2 = 16 + 20 Combine like terms: 16 + 20 = 36 t2 = 36 Simplifying t2 = 36 Take the square root of each side: t = {-6, 6}

Subproblem 2

t2 + -20 = -16 Simplifying t2 + -20 = -16 Reorder the terms: -20 + t2 = -16 Solving -20 + t2 = -16 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + t2 = -16 + 20 Combine like terms: -20 + 20 = 0 0 + t2 = -16 + 20 t2 = -16 + 20 Combine like terms: -16 + 20 = 4 t2 = 4 Simplifying t2 = 4 Take the square root of each side: t = {-2, 2}

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-6, 6, -2, 2}

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