1)а в квадрате - 13а+22

a^2 - 13a + 22 = 0 D = b^2 - 4ac = 169 - 88 = 81 = 9^2 x1 = ( 13 + 9) / 2 = 11 x2 = ( 13 - 9) / 2 = 2

[latex] a^{2} -13a+22=0 D= b^{2} -4ac D= -13^{2} -4*1*22=169-88=81 x_{1} =13+ \sqrt{81} / 2=13+9/2=22/2=11 x_{2} = 13- \sqrt{81} /2= 13-9/2= 4/2= 2 [/latex]