exam Maths Puzzle Numerical Ability

x2 ((squared)) + 7x+10 = 0

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exam Other Question

Can you help me with the following logarithm and explain how you came to the answer?:
log5x = -2 PLEASE GIVE ME 5 EXAMPLES OF THE FF:
FINDING THE DOMAIN OF
*LINEAR FUNCTION
*QUADRATIC
*SQUARE ROOT FUNCTION
*RATIONAL FUNCTION