exam Maths Puzzle Numerical Ability

Can I have some help with this expression?

Evaluate the expression and write the result in the form a + bi.

1/(9 + 2i) - 1/(2 + i)

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exam Other Question

Describe the differences in the graphs of (absolute value of X)>A and (absolute value of X)<A, where A is a positive real number. consider the following quadratic function. Reduce all fractions to the lowest terms. Find the vertex. h(x)=(x-2)(x+6)+16