D = b^2 - 4ac = (-9)^2 - 4·5·(-2) = 81 + 40 = 121
x1 = (9 - √121)/2·5 = (9 - 11)/10 = -2/10 = -0.2
x2 = (9 + √121)/2·5 = (9 + 11)/10 = 20/10 = 2
б)2x^2 + 3x - 2 = 0
D = b^2 - 4ac = 3^2 - 4·2·(-2) = 9 + 16 = 25
x2 = (-3 + √25)/2·2 = (-3 + 5)/4 = 2/4 = 0.5
в)2x^2 + 7x + 3 = 0
D = b^2 - 4ac = 7^2 - 4·2·3 = 49 - 24 = 25
x1 = (-7 - √25)/2·2 = (-7 - 5)/4 = -12/4 = -3
x2 = (-7 + √25)/2·2 = (-7 + 5)/4 = -2/4 = -0.5
г)5x^2 - 8x - 4 = 0
D = b^2 - 4ac = (-8)^2 - 4·5·(-4) = 64 + 80 = 144
x1 = (8 - √144)/2·5 = (8 - 12)/10 = -4/10 = -0.4x2 = (8 + √144)/2·5 = (8 + 12)/10 = 20/10 = 2
-5(m^2+10)+2m^3(m^2+10)=
(m^2+10)(-5+2m^3).