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Simplifying
70 + -16t2 = 20
Solving
70 + -16t2 = 20
Solving for variable 't'.
Move all terms containing t to the left, all other terms to the right.
Add '-70' to each side of the equation.
70 + -70 + -16t2 = 20 + -70
Combine like terms: 70 + -70 = 0
0 + -16t2 = 20 + -70
-16t2 = 20 + -70
Combine like terms: 20 + -70 = -50
-16t2 = -50
Divide each side by '-16'.
t2 = 3.125
Simplifying
t2 = 3.125
Take the square root of each side:
t = {-1.767766953, 1.767766953}
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