Question

(а-1)^2-(a-2)^2 если а= 1 1/2

Answer 1

$a^{2} +1-2a-( a^{2}+4-8a )= a^{2} -a^{2}+1-4-2a+8a=-3+6а [tex]-3+6а=-3+6* \frac{11}{2} =-3+ \frac{6}{1} * \frac{11}{2} =-3+33=30$