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Podes resolverlo de dos maneras
• por medio de la formula de Trinomio (cuidado con los signos!)
(x - 7) ² =
(x)² + 2(x)(-7) + (-7)² =
x² - 14x + 49
• aplicando propiedad distributiva
(x - 7)²
(x-7) (x -7)
x.x - 7.x - 7.x + 7.7
x² - 7x - 7x + 49
x² - 14x + 49
♣ (2x+y)²
(2x)² + 2(2x)(y) + y²
4x² + 4xy + y²
espero que te sirva, salu2!!!!