-t^2+21t-270=0

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Solution for -t^2+21t-270=0 equation:


Simplifying
-1t2 + 21t + -270 = 0

Reorder the terms:
-270 + 21t + -1t2 = 0

Solving
-270 + 21t + -1t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
270 + -21t + t2 = 0

Move the constant term to the right:

Add '-270' to each side of the equation.
270 + -21t + -270 + t2 = 0 + -270

Reorder the terms:
270 + -270 + -21t + t2 = 0 + -270

Combine like terms: 270 + -270 = 0
0 + -21t + t2 = 0 + -270
-21t + t2 = 0 + -270

Combine like terms: 0 + -270 = -270
-21t + t2 = -270

The t term is -21t.  Take half its coefficient (-10.5).
Square it (110.25) and add it to both sides.

Add '110.25' to each side of the equation.
-21t + 110.25 + t2 = -270 + 110.25

Reorder the terms:
110.25 + -21t + t2 = -270 + 110.25

Combine like terms: -270 + 110.25 = -159.75
110.25 + -21t + t2 = -159.75

Factor a perfect square on the left side:
(t + -10.5)(t + -10.5) = -159.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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