<span>4(0,5p−10)−14p+14=2p-40-14p+14=-12p-26</span>
3.24-z²=0
z²=3.24
z₁=1.8 z₂=-1.8
k²-196/625=0
k²=196/625
k₁=14/25 k₂=-14/25
А²+4 = а²+4а+4 - 4а = (а+2)² -4а
а² - 1 + 5а = а²+5а - 1 = а²+2а+3а-1=а²+2а-1 + 3а = -(а-1)²+2а²+3а =
18х +4+9х² = 9х²+18х+4 = 9х²+12х+4+6х = (3х+2)²+6х