book Maths Puzzle Numerical Ability

y eqauls x to the second power plus 6x plus 8

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Hello,
Could you please help me understand how to work this problem? It is ( 4 square root of 2 ) all to the 5 power.This is from an internet trigonometry class and the online boo We are doing these questions in math class and i am so lost especially that its a spanish class and my teacher only speaks spanish so i don't know how to ask him because i don't sp