exam Maths Puzzle Numerical Ability

what is the square root of x^2-2x+1?

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exam Other Question

I am trying to show the result of adding two fractions.
x=times and /= divide

What are the steps to show that
u x i/2pi x (D+d)+ u x i/2pi x (D-d) is equalt to u x i x D/pi(D sq -d sq)

Hope you can help Please help me with this problem. I am not quite sure how to set it up.
A physician invests $24,000 in two bonds. If one bond yields 6% and the other yields 12 %, how much is invested in each if the annual income from both bonds is $1980?