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Unformatted text preview: zero which means there is only one root. The cars are side by side only once at t = 4 s. (c) A sketch is shown below. It consists of a straight line ( x A ) tangent to a parabola ( x B ) at t = 4. (d) We only care about real roots, which means 10 2 2( 20)( a B ) 0. If | a B | > 5/2 then there are no (real) solutions to the equation; the cars are never side by side. (e) Here we have 10 2 2( 20)( a B ) > 0 two real roots. The cars are side by side at two different times....
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- Spring '06