exam Maths Puzzle Numerical Ability

need to determine if the given x-value is a zero of the function - show work
f(x)=x^3 + 5x^2 + 2x - 8
**is x = -2 a root
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LLO

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exam Other Question

Write the equation of the line with slope -2 and y-intercept (0, 0). Then graph the line. what is the value of X in this equation?
X - 87.4 = 57.52