Question

Calcule o valor de (4x-1)², sendo que x=[(6-1)³.(7-2)]/5³

Answer 1

x = $\frac{(6 - 1)^3 . (7 - 2)}{5^3}$
x = $\frac{5^3 . 5}{5^3}$
x = $\frac{5^4}{5^3}$
x = 5⁴⁻² = 5

(4x - 1)² = 
(4x - 1) . (4x - 1) = 
4x² - 4x - 4x + 1² = 
4x² - 8x + 1 = 
(4 . 5)² - 8 . 5 + 1 = 
20² - 40 + 1
400 - 40 + 1 = 361