Question

determine o valor numerico de cada expressao algebrica a) (A-B)2 -c2,quando a=2/3,b=1 e c=-1.

Answer 1

a)$<var>(a-b)^2-c^2=(\frac{2}{3}-1)}-(-1)^2=-\frac{1}{3}-1=-\frac{4}{3}</var>$ 

 

 

Answer 2

$(a - b) {}^{2} - c {}^{2} \\ ( \frac{2}{3} - 1) {}^{2} - ( - 1) {}^{2} \\ ( \frac{2 - 3}{3} ) {}^{2} - ( - 1) {}^{2} \\ ( - \frac{1}{3} ) {}^{2} - ( - 1) {}^{2} \\ \frac{1}{9} - 1 \\ \frac{1 - 9}{9} \\ \boxed{\boxed{\boxed{ - \frac{8}{9} }}}$

atte. yrz