Question

a. (7x-3)²=
b.
$( \frac{9}{5} - \frac{1}{2} x) {}^{2} =$
ayudaaa​

Answer 1

Explicación paso a paso:

Formula de binomio al  cuadrado:

(a ± b)² = a² ± 2ab + b²

Resolvamos:

a.

(7x-3)² = (7x)² - 2(7x)(3) + (3)²

(7x-3)² = 49x²-42x+9

b.

(9/5-1/2x)² = (9/5)² - 2(9/5)(1/2x) + (1/2x)²

(9/5-1/2x)² = 81/25 - 18/10x + 1/4x²

(9/5-1/2x)² = 81/25 - 9/5x + 1/4x²