Solving Radical Equation #mathteachergon #radicalequations

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Solving Radical Equation #mathteachergon #radicalequations
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Добрый день! Данный пример легкий и его можно решить в уме.
1) На какое число надо умножить 3, чтобы получить 21? Ответ: 7
2) Как сделать так, чтобы засунуть 7 под корень? Ответ: Возвести 7 в квадрат. Но…
3) Если мы возведём 7 в квадрат, то у нас же получится 49+1 под корнем? Ответ: Так а мы и не будем складывать эти числа, мы просто вычтем из 49 — 1. И таким образом у нас получится, что x=48.

Проверяем: 3*v48+1=21; 3*v49=21; 3*7=21.

ЖенькаИзТюмени