Question

ayuda productos notables...3(x+2)(x-2)=(x-4)^2+8x

Answer 1

Resolvemos.

3(x + 2)(x - 2) = (x - 4)² + 8x

3(x² - 2²) = (x¹)² - 2(x)(4) + 4² + 8x

3(x² - 4) = x² - 8x + 16 + 8x

3x² - 12 = x² + 16

3x² - x² = 16 + 12

2x² = 28
 
  x² = 28/2
 
  x² = 14
 
  x = √14