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Pero primero recordemos que es el binomio al cuadrado.
(a - b)² = a² - 2ab + b²
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(5 - 3x)² - 64 = 0
(5² - 2(5)(3x) + (3x¹)²) - 64 = 0
(25 - 30x + 9x²) - 64 = 0
25 - 30x + 9x² - 64 = 0
25 - 64 - 30x + 9x² = 0
- 40 - 30 + 9x² = 0