Question

Ex 4 Punctele B,C,D.

Answer 1

b) x²+2x+1-x²+6x-9≥x²-2x+1-x²+4x-4

8x²-8≥2x-3

8x-2x≥8-3

6x≥5, x≥5/6

c) 8x +8 -4x+12 <3x +36

4x +20<3x +36

4 x - 3x < 36-20

x < 16

d)( x+2)² - 3 (x+4) > (x+3)(x-5)-2

x² +4x +4-3x -12 > x²-5x+3x-15-2

x²+x-8>x²-2x-17

x²+x-x²+2x>8-17

3x>-19

x> 19/3