Предмет: Алгебра, автор: Габикус

(5х-12) в квадрате=(5х-3)в квадрате(решите уравнение)

Ответы

Автор ответа: lauracrowford

Тут формула сокр умножения. Квадрат суммы
Раскрываем по формуле
25х^2-2*5х*12+144=25х^2-2*5х*3+9=0
25х^2-120х+144-25х^2+30х-9=0
-120х+30х+123=0
-90х+135=0
Х=135/90
Х=-1,5

lauracrowford: стоп там не минус полторы, а плюс

lauracrowford: -90х=-135

lauracrowford: умножаем обе стороны на -1 . потом получаем 90х=135. х=-1,5

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