Question

1) Resolva as inequações,sendo U=R:

a) x + 7 > 19
b) 3 ( x + 4 ) - 10 < x + 15

2) Fatore:
x² + 7x + 12 =

Answer 1

a) $x+7>19$

$x>12$

b) $3(x+4)-10<x+15$

$3x+12-10<x+15$

$3x-x<15-2$

$2x<13$

$x<\dfrac{13}{2}$

2)

$x^2+7x+12=x^2+4x+3x+12=x(x+4)+3(x+4)=(x+3)(x+4)$