document.write( "Question 289946: can you determine d, if given the quadratic formula d=-5t2+10t+5 ? and you have no other information? \n" ); document.write( "
Algebra.Com's Answer #209897 by richwmiller(17219)\"\" \"About 
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No. You can graph it.
\n" ); document.write( "Because it equals -5*(t^2-2 t-1) and it crosses the t axis at 1-sqrt(2) and 1+sqrt(2). Those are its zeros.
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