9. Задайте формулою лінійну функцію, графія якої паралельні прямів у 5х 48 та проходить через початок хоорон.
У завдання 16" е беріть правильну, а у у відео
1. Нехай я см - довжина сторони кадрата, а у
метр. Задайте формулою функцію у ва х.
Варiант 2
А
В
ре 4
у 2
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Объяснение:

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а) x²-5x-14=0
Найдём дискриминант:
D=(-5)²-4*1*(-14)=25+56=81=9²
т.к D>0,то уравнение имеет 2 корня:
x1=5+9/2=14/2=7    x2=5-9/2= -4/2= -2
б) x²-x-6=0
D=(-1)²-4*1*(-6)=1+24=25=5²
x1=1+5/2=6/2=3   x2=1-5/2= -4/2= -2
в) x²+4x-21=0  
D=4²-4*1*(-21)=16+84=100=10
x1= -4+10/2=6/2=3    x2= -4-10/2= -14/2= -7
г)x²+x=12
x²+x-12=0
D=1²-4*1*(-12)=1+48=49=7²
x1= -1+7/2=6/2=3  x2= -1-7/2= -8/2= -4
д) 2x²-10x=0
D=(-10)²-4*2*0=100=10²
x1=10+10/4=20/4=5  x2=10-10/4=0/4=0
е)x²-7x-18=0
D=(-7)-4*1*(-18)=49+72=121=11²
x1=7+11/2=18/2=9  x2=7-11/2= -4/2= -2
ж) x²+7x-18=0
D=7²-4*1*(-18)=49+72=121=11²
x1= -7+11/2=4/2=2    x2= -7-11/2= -18/2=9
з) x²+3x-18=0
D=3²-4*1*(-18)=9+72=81=9²
x1= -3+9/2=6/2=3  x2= -3-9/2= -12/2= -6
и)3x²+18x=0
D=18²-4*3*0=324=18²
x1= -18+18/6=0/6=0      x2= -18-18/6= -36/6= -6