2x2 + 7x - 9 = 0D = b2 - 4acD = 49 + 72 = 121 = 11^2
x1,2 = -b ± √D/2ax1 = -7 + 11/4 = 4/4 = 1x2 = -7 - 11/4 = - 18/4 = - 9/2ответ: x1 = 1 ; x2 = - 9/2
2x^2+7x-9=0
D=49-4*2*(-9)=121
х1=-7-11/4=-4,5
х2=-7+11/4=1
ответ: -4,5; 1.
2x2 + 7x - 9 = 0
D = b2 - 4ac
D = 49 + 72 = 121 = 11^2
x1,2 = -b ± √D/2a
x1 = -7 + 11/4 = 4/4 = 1
x2 = -7 - 11/4 = - 18/4 = - 9/2
ответ: x1 = 1 ; x2 = - 9/2
2x^2+7x-9=0
D=49-4*2*(-9)=121
х1=-7-11/4=-4,5
х2=-7+11/4=1
ответ: -4,5; 1.