Try, pls, this decision (step by step).
Point (5.8;-2;4.2) belongs to the plane and line.
Point (5.8;-2;4.2) belongs to the plane and line.
Please help will mark brainliest
1 answer:
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When h=0, that is when it hits the ground
0=70-4t-16t²
based on your previous questions, you should have learned how to complete the square
solve by copmleting the square
minus 70 both sides
-70=-4t-16t²
times both sides by -1
70=4t+16t²
16t²+4t=70
divide both sides by 16
t²+1/4t=35/8
take 1/2 of the linear coefint and square it
half of 1/4=1/8, (1/8)²=1/64
add that to both sides
t²+1/4t+1/64=35/8+1/64
factor perfect square trionomial
square root both sides, remember to take positive and negative roots
minus 1/8
or 
the 2nd solution is not valid because that gives us a negative time, before the ball was dropped
so is the solution
t≈1.97
1.97 seconds
0=70-4t-16t²
based on your previous questions, you should have learned how to complete the square
solve by copmleting the square
minus 70 both sides
-70=-4t-16t²
times both sides by -1
70=4t+16t²
16t²+4t=70
divide both sides by 16
t²+1/4t=35/8
take 1/2 of the linear coefint and square it
half of 1/4=1/8, (1/8)²=1/64
add that to both sides
t²+1/4t+1/64=35/8+1/64
factor perfect square trionomial
square root both sides, remember to take positive and negative roots
minus 1/8
the 2nd solution is not valid because that gives us a negative time, before the ball was dropped
so
t≈1.97
1.97 seconds