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)

3a + 1 = -5
3a = -5 - 1
3a = -6
a = -6/3 = -2 ***

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

[ 3(-2)  + 1 ] [  14 ( 4/7) - 8 ]
[ -6 + 1] [ 8 - 8 ]
[ -5 ] [ 0 ]  = 0 ***

Nota 14 * 4/7 = 56/7 = 8 ***