Question

Fatore o polinomio 42ab + 14b – 24a-8 e determine o valor numerico desse polinomio para 3a + 1= -5 e 7b – 4= 0

Answer 1

42ab + 14b - 24a - 8 =
14b ( 3a + 1) - 8 ( 3a + 1)
( 3a + 1) ( 14b - 8) ***
[ 3 ( 4/3) + 1 ] [ 14 ( 4/7) - 8 ] =
[ 4 + 1 ]  [ 8 - 8 ] =
(5 ) ( 0 )  =  0   zero  ****

Notas  3 . 4/3  = 12/3 = 4 ***
14 * 4/7  = 56/7 = 8 ***

3a + 1 = -5
3a = 5 - 1
3a = 4
a = 4/3 ***

7b - 4 = 0
7b = 4
b = 4/7 ***