Question

3. Решите уравнение (5х+2)²-(5х-3)(5х+3)= 7​

Answer 1

(5х+2)²-(5х-3)(5х+3)= 7​

$25x^{2} +20x+4-(25x^{2} -9)=7\\25x^{2} +20x+4-25x^{2} +9=7\\20x=7-13\\x=-0,3$

Ответ: -0,3