-400=-16t^2+20

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Solution for -400=-16t^2+20 equation: 


Simplifying
-400 = -16t2 + 20

Reorder the terms:
-400 = 20 + -16t2

Solving
-400 = 20 + -16t2

Solving for variable 't'.

Move all terms containing t to the left, all other terms to the right.

Add '16t2' to each side of the equation.
-400 + 16t2 = 20 + -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-400 + 16t2 = 20 + 0
-400 + 16t2 = 20

Add '400' to each side of the equation.
-400 + 400 + 16t2 = 20 + 400

Combine like terms: -400 + 400 = 0
0 + 16t2 = 20 + 400
16t2 = 20 + 400

Combine like terms: 20 + 400 = 420
16t2 = 420

Divide each side by '16'.
t2 = 26.25

Simplifying
t2 = 26.25

Take the square root of each side:
t = {-5.123475383, 5.123475383}

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