11t-4t^2=21

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Solution for 11t-4t^2=21 equation:


Simplifying
11t + -4t2 = 21

Solving
11t + -4t2 = 21

Solving for variable 't'.

Reorder the terms:
-21 + 11t + -4t2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + 11t + -4t2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
5.25 + -2.75t + t2 = 0

Move the constant term to the right:

Add '-5.25' to each side of the equation.
5.25 + -2.75t + -5.25 + t2 = 0 + -5.25

Reorder the terms:
5.25 + -5.25 + -2.75t + t2 = 0 + -5.25

Combine like terms: 5.25 + -5.25 = 0.00
0.00 + -2.75t + t2 = 0 + -5.25
-2.75t + t2 = 0 + -5.25

Combine like terms: 0 + -5.25 = -5.25
-2.75t + t2 = -5.25

The t term is -2.75t.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75t + 1.890625 + t2 = -5.25 + 1.890625

Reorder the terms:
1.890625 + -2.75t + t2 = -5.25 + 1.890625

Combine like terms: -5.25 + 1.890625 = -3.359375
1.890625 + -2.75t + t2 = -3.359375

Factor a perfect square on the left side:
(t + -1.375)(t + -1.375) = -3.359375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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