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    • https://espanol.libretexts.org/Matematicas/Algebra/Libro%3A_Algebra_elemental_(Arnold)/08%3A_Funciones_cuadr%C3%A1ticas/8.02%3A_Simplificar_expresiones_radicales
      \[\begin{array}{rlrl}{a^{2}+b^{2}} & {=c^{2}} & {} & \color {Red} {\text { Pythagorean Theorem. }} \\ {x^{2}+x^{2}} & {=8^{2}} & {} & \color {Red} {\text { Substitute: } x \text { for } a, x \text { f...\[\begin{array}{rlrl}{a^{2}+b^{2}} & {=c^{2}} & {} & \color {Red} {\text { Pythagorean Theorem. }} \\ {x^{2}+x^{2}} & {=8^{2}} & {} & \color {Red} {\text { Substitute: } x \text { for } a, x \text { for } b, 8 \text { for } c .} \\ {2 x^{2}} & {=64} & {} & \color {Red} {\text { Combine like terms: } x+x=2 x} \\ {x^{2}} & {=32} & {} & \color {Red} {\text { Divide both sides by } 2}\end{array} \nonumber \]

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