90=-16t^2+155

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Solution for 90=-16t^2+155 equation: 


Simplifying
90 = -16t2 + 155

Reorder the terms:
90 = 155 + -16t2

Solving
90 = 155 + -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.
90 + 16t2 = 155 + -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
90 + 16t2 = 155 + 0
90 + 16t2 = 155

Add '-90' to each side of the equation.
90 + -90 + 16t2 = 155 + -90

Combine like terms: 90 + -90 = 0
0 + 16t2 = 155 + -90
16t2 = 155 + -90

Combine like terms: 155 + -90 = 65
16t2 = 65

Divide each side by '16'.
t2 = 4.0625

Simplifying
t2 = 4.0625

Take the square root of each side:
t = {-2.015564437, 2.015564437}

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