Question

A. 6x ( 10 - 4x )
B. ( a + b ) (5a + 8b)
C. 4 (2x+ 3y - 8z)
D. 10b (2a + 4b - 10)
E. (x + y) (x - y)
me ajudem, por favor

Answer 1

$a) \\ 6x \: . \: (10 - 4x) \\ 6x \: . \: 10 - 6x \: . \: 4x \\ \boxed{\boxed{\boxed{60x - 24x {}^{2} }}}$

$b) \\ (a + b) \: . \: (5a + 8b) \\ a \: . \: (5a + 8b) + b \: . \: (5a + 8b) \\ 5a {}^{2} + 8ab + 5ab + 8b {}^{2} \\ \boxed{\boxed{\boxed{5a {}^{2} + 13ab + 8b {}^{2} }}}$

$c) \\ 4 \: . \: (2x + 3y - 8z) \\ 4 \: . \: 2x + 4 \: . \: 3y - 4 \: . \: 8z \\ \boxed{\boxed{\boxed{8x + 12y - 32z}}}$

$d) \\ 10b \: . \: (2a + 4b - 10) \\ 10b \: . \: 2a + 10b \: . \: 4b - 10b \: . \: 10 \\ \boxed{\boxed{\boxed{20ab + 40b {}^{2} - 100b}}}$

$e) \\ (x + y) \: . \: (x - y) \\ \boxed{\boxed{\boxed{x {}^{2} - y {}^{2} }}}$

att. yrz