exam Maths Puzzle Numerical Ability

Perform the indicated operations:
(5x2 - 3x + 2) + (-3x2 - 5x - 8) - (x2 + 3x - 10)

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exam Other Question

Solve for x:
a) log base4 (x+2) + log base4 (n-4)=2
b) log base2 (x^2-2) - log base2 (1/2x+5)=1 Can someone please help me with these and show me how to check my answers ?????? angle BFA and angle DFE are vertical angles. If angle BFA=3r+12 and the measure of angle DFE=-8r+210, what is the measure of angle AFE?