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# Polynomial Arithmetic

From profit/cost models to the flight of a baseball to approximating the motion of a wave, polynomials are a mathematical way to represent values which are sums of powers of variables.

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Given that \( x^2 - y^2 = (x-y) ( x+y)\), what is the value of \( 31 ^2 - 19 ^2 \)?

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If \(x+y=6\), \(x-y=2\) and \(x^2+y^2=20\), what is the value of \[x^4-y^4?\]

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Evaluate the above expression.

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Find the positive value of \(N\) such that \[ N^2 = 169.\]

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