A(-8,6) B(a,4) O(0,0)
M mij lui OA => M((0-8)/2 , (6+0)/2)=>M(-4,3)
[tex]ma = \sqrt{{( - 8 - ( - 4)) }^{2} +{ (6 - 3) }^{2} }[/tex]
=> MA=5
[tex]ob = \sqrt{ {(a - 0)}^{2} + {(4 - 0)}^{2} } [/tex]
=>
[tex]ob = \sqrt{ {a}^{2} + 16} [/tex]
MA=OB
=> 25=a²+16
=> a²=9
=>a=±3
a1=-3 a2=3
