y = ax²+bx+c
1)(0; -3)
c = -3
2)(4;7)
16a+4b+c = 7
16a+4b = 10
3)(-4; -1)
16a-4b+c = -1
16a-4b = 2
4)
{16a+4b =10
{16a-4b = 2
32a = 12
a = 3/8
4b = 10-16a = 10-6 = 4
b = 1
ответ: y = 3/8x²+x-3
y = ax²+bx+c
1)(0; -3)
c = -3
2)(4;7)
16a+4b+c = 7
16a+4b = 10
3)(-4; -1)
16a-4b+c = -1
16a-4b = 2
4)
{16a+4b =10
{16a-4b = 2
32a = 12
a = 3/8
4b = 10-16a = 10-6 = 4
b = 1
ответ: y = 3/8x²+x-3