

a^{2} + b^{2} = c^{2}
3^{2} + 4^{2} = c^{2} 3x3 + 4x4 = c^{2} 9+16 = c^{2} 25 = c x c c = 5 
a^{2} + b^{2} = c^{2}
a^{2} + 12^{2} = 15^{2} a^{2} + 144 = 225 Subtract 144 from each side to get: 144  144 + a^{2} = 225  144 a^{2} = 225  144 a^{2} = 81 a = 9 
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