Question

ME AJUDAM A FAZER ESTAS ATIVIDADES?

Answer 1

a) 25 x$^{2} + 5 x - 5 x - 1 = 25 x^{2} - 1$

b) $a ^{2}+ ab +ab + b ^{2} = a ^{2} + 2ab + b ^{2}$

c) $10 x^{3} - 4 x^{2} -15 x^{2} -6 x - 30x + 12 = 10 x^{3} - 19 x^{2} - 24x + 12$

d) $2a ^{2} - (2a/2) b + (3a/5)b - (3/10) b ^{2} =$
$2a ^{2} + (1a/3)b - (3/10)b ^{2}$

72)
(2x + 1) . (x + 1)
2x$^{2} + 2x + x + 1 =$
$2x^{2} + 3x + 1$

73)
a)
    A . B
$( x^{2} + 3x - 2) . (x + 2) =$
$x^{3} + 2 x^{2} + 3 x^{2} + 6x - 2x - 4 =$
$x^{3} + 5 x^{2} + 4x - 4$


         A . C
$( x^{2} + 3x - 2) . (x - 3) =$
$x^{3} - 3 x^{2} + 3 x^{2} - 9x - 2x + 6 =$
$x^{3} - 11x + 6$


(a . b) + (a . c)
$( x^{3} + 5 x^{2} +4x - 4) + ( x^{3} - 11x + 6) =$
$2 x^{3} + 5 x^{2} - 7x + 2$

B)       B + C
     $(x + 2) . (x - 3) =$
     $x^{2} - 3x + 2x - 6 =$
     $x^{2} - x - 6$


      A . (B + C)
      ($x^{2} + 3x - 2) . ( x^{2} - x - 6) =$
      $x^{4} - x^{3} - 6 x^{2} + 3 x^{2} - 3 x^{2} - 18 x - 2 x^{2} + 2x + 12 =$
      $x^{4} - x^{3} - 8 x^{2} - 16x + 12$



74)
a) (6x$^{2} - 9x) . (x + 2) =$
    $6 x^{3} + 12 x^{2} - 9 x^{2} - 18x =$
    $6x ^{3} + 3 x^{2} - 18x$

b)$- 2 x . ( x + 5) . (2x - 5) =$
$(- 2 x^{2} - 10x) .(2x - 5) =$
$- 4 x^{3 } + 10 x^{2} - 20 x^{2} + 50x =$
- 4$x^{3} - 10 x^{2} + 50x$

c)

d)  (a -b) . (a + b) .   (3a - b)
    $(a ^{2} + ab - ab - b ^{2}) . (3a - b) =$
    $3a ^{3} - 3a ^{2} b + 3a ^{2}b - 3ab ^{2} - 3a ^{2}b + 3ab ^{2} - 3ab ^{2} + b ^{3} =$
    $3a ^{3} - 3a ^{2}b - 3ab ^{2} + b ^{3}$


e) não sei fazer kkkkk