exam Maths Puzzle Numerical Ability

I have to combine if possible...Do not use a calculator or a table of square roots...Can you help me please?

Page 530
Number6
square root 5 - 3square2w - square 50w

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exam Other Question

how to prove taht the diagnols of a restangle are equal through a practical activity Suppose T is equal to x over y and R is equal to w over z, show that xz plus yw all over yz-xw is equal to t plus r all over one minus tr.