Posted by steve Alexander on Wednesday, October 29, 2008 at 12:42am.
s=4.9t²+245t+14.7
s=4.9(t²245/4.9t)+14.7
s=4.9(t²50t)+14.7
s=4.9(t²50+625625)+14.7
s=4.9(t²50+625)+(4.9)(625)+14.7
s=4.9(t25)²+30625.5+14.17
s=4.9(t25)²+3077.2
as you can see on the process of the problem on the part that says...s=4.9(t²50+625625)+14.7...the +625625 on the next step are on different positions like...4.9(t²50+625)...and(4.9)(625)...i want to know why and why the negative 625 its multiplying by the negative 4.9 please if somebody can explain me all this problem

calculus  Reiny, Wednesday, October 29, 2008 at 1:19am
the line
.....s=4.9(t²50+625625)+14.7 ......
has a typo, should have been
s=4.9(t²50t+625625)+14.7 , look at the bold part in the next line
s=4.9(t²50t+625625)+14.7
s=4.9[(t25)²625)]+14.7 , now the 4.9 has to be multiplied by both terms inside the square bracket
s = 4.9(t25)²  4.9(625) + 14.7
s = 4.9(t25)² + 3077.2
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