4x^2 + 5x + 1 = 0
D = 25 - 16 = 9
x1 = ( - 5 + 3)/8 = - 1/4 = - 0.25
x2 = ( - 5 - 3)/8 = - 8/8 = - 1
<span><span>(a+3)2</span>−2a(3−4a)</span> = a2+6a+9-6a+8a2=9a2+9=9(a2+1)
<span>a=−<span>13
9(169+1)=9*170=<u>1530</u></span></span>
0.5 * 2^2 = 0.5* 4 =2
2-3x+4=0
-3x= -2-4
3x = 2+4
3x = 6
x = 2