+118703 gino has just replaced all the t's with x's.
He has only done this because it is much mor normal to see equations like this with an x instead of a t.
There are no x'es in your question.
height=−25t2+75t+24$Theaxisofsymmetrywillbeattime$t=−752∗−25=t=32=1.5secs
So the ball will be at the maximum height after 1.5 seconds
+23254 You are looking for the x-value of the vertex.
An easy way to find this point is to graph it.
If you do not want to graph it, then memorize the formula for finding the x-value of the vertex: x = -b/(2a).
Because your expression is written correctly, a = -25, b = 75, and c = 24.
Therefore, the x-value of the vertex is -(75) / (2·-25) = -75 / -50 = 1.5 <--- the time.
To find the height, replace x wby 1.5 in the original expression.
+118703 gino has just replaced all the t's with x's.
He has only done this because it is much mor normal to see equations like this with an x instead of a t.
There are no x'es in your question.
height=−25t2+75t+24$Theaxisofsymmetrywillbeattime$t=−752∗−25=t=32=1.5secs
So the ball will be at the maximum height after 1.5 seconds
