Уравнение не будет иметь корней при
Т.е. при a=1
Ответ:
120 = (-12) × (-10)
120 = 10 × 12
Объяснение:
x × (x + 2) = 120
x^2 + 2x = 120
x^2 + 2x - 120 = 0
D = b^2 - 4ac
a = 1
b = 2
c = -120
D = 4 - (-480) = 484 = 22^2 = 22 × 22
x1 = ( -b - VD) / 2a = (-2-22)/2 = -24/2
x1 = -12
x + 2 = x1 + 2 = (-12) + 2 = -10
x2 = (-b + VD) / 2a = (-2+22)/2 = 20/2
x2 = 10
x + 2 = x2 + 2 = 10 + 2 = 12
<span>4x^2-5x-6=0
D = 25 + 4*4*6 = 121
x1 = (5 - 11)/8 = -6/8 = -3/4
x2 = (5+11)/8 = 16/8 = 2
</span><span>2)-3x^2=x
-3x^2 - x = 0
3x^2 + x = 0
x(3x + 1) = 0
x = 0; x = -1/3
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