Book Maths Puzzle Algebra

How to sulve a quadratic equation by completing the square.
2s^2+5s=3

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Book Other Question

How do I find the answer to the following?

The Hypotonuse is 6. The triangle is a 30-60-90. Find sides a and b.
I can't use pythagorean theorem can I? im having trouble solving this problem for my homework. the book says=
' Use linear combinations to solve the system.'
x-y=4
x+y=12