Question

(2-5x) totul la pătrat
(3x-1/2)totul la pătrat

Answer 1

(2-5x)²=2²-2·2·5x+(5x)²
=4-20x+25x²

(3x- $\frac{1}{2}$)²=(3x)²-2·3x· $\frac{1}{2}$+ ($\frac{1}{2}$)²

=9x²-3x+ $\frac{1}{4}$

Answer 2

(2 - 5x)² = 2² - 2×2×5x + (5x)² = 4 - 20x + 25x²

(3x - 1/2)² = (3x)² - 2×3x×1/2 + (1/2)² = 9x² - 3x + 1/4