Question

Si (a+b)2 = 225, calcular ab + ba + aa + bb

Answer 1

Respuesta:

$225b+\frac{57375}{4}$

Explicación paso a paso:

(a+b)2 = 225

$a = \frac{225}{2}-b$

Entonces:

$(\frac{225}{2}-b) b+b(\frac{225}{2})+\frac{225}{2} * \frac{225}{2}+b*b\\\\\frac{225}{2}b-b^{2} +\frac{225}{2}b+\frac{57375}{4}+b^{2} \\\\\frac{225}{2}b +\frac{225}{2}b+\frac{57375}{4}\\\\225b+\frac{57375}{4}$