1/5x^2=64/5
x^2=64/5*5/1
x^2=64
x=+-√64
x1=8
x2=-8
больший 8
(138-38)(138+38)/(122-78)(122+78)=100×176/44×200=176/4400=0.04
D=1-4*6*0=1
х1=-1+1/2*6=0
х2=-1-1/12=-1/6
<span>4x^2 - 7x - 2 = 0
Δ = b^2 - 4ac = 49 + 4*4*2 = 49+32 = 81 = 9^2
x1 = (7+9)/8 = 2
x2 = (7-9)/8 = -0,25
</span>
<span>4x^2 + 2x + 1 = 0</span>
<span>Δ = b^2 - 4ac = 4 - 4*4 = 4 - 16 = - 12<0
нет решений
</span>x^2 - 3x - 88 = 0
Δ = b^2 - 4ac = 9 + 4*88 = 361 = 19^2
x1 = (3+19)/2 = 11
x2 = (3-19)/2 = - 8