2)
2(5x+3)-1>7x-2
10x+6-1>7x-2
10x-7x>-2-5
3x>-7
x>-7/3 ⇒x∈(-7/3, +∞)
4(2x+3)-3≤6x-7
8x+12-3≤6x-7
8x-6x≤-7-9
2x≤-16
x≤-8 ⇒ x∈(-∞; -8]
(4-√2)²+4√8=4²-2*4*√2+(√2)²+4√8=16-8√2+2+4√8=18-4*√4*√2+4√8=18-4*√(4*2)+4√8=18-4√8+4√8=18
(√3+2)²-2√12=(√3)²+2*2*√3+2²-2√12=3+2*√4*√3+4-2√12=7+2√12-2√12=7