Use some of the digits 1,3,5,7,9 only once to write 5 numbers less than 2000
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The net would look like a square surrounded with four triangles, one on each side.
We have that
<span>y=3x</span>²<span>+18x-21
using a graph tool
see the attached figure
the solutions are
x=-7
x=1</span>
<span>y=3x</span>²<span>+18x-21
using a graph tool
see the attached figure
the solutions are
x=-7
x=1</span>