exam Maths Puzzle Numerical Ability

1) Write a quadratic equation having the given numbers as solutions
-10 and -5

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I am confused how do I solve this??? I am totaly confused.
Give the degree. 7x can someone PLEASE help me solve this system:
{ x+ y-4z=6
{2x-5y+3z=2
{ x-6y+7z=-4
thank you so much!