Răspuns: [tex]\boxed{\boxed{\bf x_{1} =+\dfrac{5}{2}~;~ x_{2} =- \dfrac{5}{2}}}[/tex]
Explicație pas cu pas:
Salutare!
[tex]\bf -4x^{2} +25 = 0[/tex]
[tex]\bf -4x^{2} =-25~~~~\bigg|:(-4)[/tex]
[tex]\bf x^{2} =\dfrac{25}{4}[/tex]
[tex]\bf x =\sqrt{\dfrac{25}{4}}[/tex]
[tex]\bf x =\sqrt{\dfrac{5^{2} }{2^{2}}}[/tex]
[tex]\bf x =\pm \dfrac{5}{2}[/tex]
[tex]\boxed{\boxed{\bf x_{1} =+\dfrac{5}{2}~;~ x_{2} =- \dfrac{5}{2}}}[/tex]
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