Question 1194305
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An alternative path to the answer is using Vieta's theorem with the two given roots.<br>
The sum of the given roots is 4; the product is -1.  So the function is of the form<br>
{{{y=a(x^2-4x-1)}}}<br>
The constant a is determined by the given point.<br>
{{{10=a(4-8-1)}}}
{{{10=-5a}}}
{{{a=-2}}}<br>
ANSWER: The function is {{{y=-2(x^2-4x-1)}}} or {{{y=-2x^2+8x+2}}}<br>