Предмет: Алгебра, автор: Diana220997

Решите уравнение 25x²-16=0

Ответы

Автор ответа: nafanya2014

0

Применяем формулу разности квадратов и раскладываем выражение слева на множители:
(5х-4)(5х+4)=0
5х-4=0 или 5х+4=0
5х=4 или 5х=-4
х=4/5 или х=-4/5
х=0,8 или х=-0,8

Автор ответа: julyap

0

$25 x^{2} -16=0 \ (5x-4)(5x+4)=0 \ 5x-4=0 \ 5x=4 \ x=0.8 \ 5x+4=0 \ 5x=-4 \ x=-0.8$

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