oblicz: 7x²+8x-15=0
7x²+8x-15=0
delta = b^2 -4*a*c= 64 + 420 =484
pier z delty= 22
x1= -b - pier z delty/2a = -8 -22/-14 = -30/-14 = 2 1/7
x2 = -b + pier z delty/2a= -8 +22 /-14= 14/-14 = -1
x nalezy { -1; 2 1.7}
a=7 b=8 c= -15delta= bkwadrat - 4acdelta= 8kwadrat - 4*7*-15=64- 28*-15 = 64 +420
=484 2 rozwiazania
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7x²+8x-15=0
delta = b^2 -4*a*c= 64 + 420 =484
pier z delty= 22
x1= -b - pier z delty/2a = -8 -22/-14 = -30/-14 = 2 1/7
x2 = -b + pier z delty/2a= -8 +22 /-14= 14/-14 = -1
x nalezy { -1; 2 1.7}
a=7 b=8 c= -15
delta= bkwadrat - 4ac
delta= 8kwadrat - 4*7*-15
=64- 28*-15 = 64 +420
=484 2 rozwiazania