Question

7x(2+x)-7x(x+3)=74

các bạn giúp mình nhé mình sẽ KB với bạn

 

Answer 1

7x(2+x)-7x(x+3)=74

7x(x+2)-7x(x+3)=74

7x² + 14x - 7x² - 21x = 74

14x - 21x = 74

-7x = 74

\(\frac{-7x}{-7}=\frac{74}{-7}\)

x = \(\frac{74}{-7}\)

Answer 2

\(7x\left(2+x\right)-7x\left(x+3\right)=74\)

\(\Leftrightarrow14x+7x^2-7x^2-21x=74\)

\(\Leftrightarrow-7x=74\Leftrightarrow x=-\frac{74}{7}\)

Answer 3

Không có nhu cầu kb

7𝑥(2+𝑥)−7𝑥(𝑥+3)=74

7𝑥(2+𝑥)−7𝑥(𝑥+3)=74

7𝑥(𝑥+2)−7𝑥(𝑥+3)=74

7𝑥²+14𝑥−7𝑥(𝑥+3)=74

7𝑥²+14𝑥−7𝑥²−21𝑥=74

14𝑥−21𝑥=74

−7𝑥=74

𝑥=−74/7

Answer 4

7x(2+x)-7X(x+3)=74

14x+7-7x-21=74

14x-21x       =74-7+7

-7x              =60

    x             =60/-7

    x             =-60/7

Answer 5

x= -74/4 đúng ko bn

Answer 6

\(7x\left(2+x\right)-7x\left(x+3\right)=74\)

\(< =>7x\left(2+x-x-3\right)=74\)

\(< =>7x.\left(-1\right)=74\)

\(< =>-7x=74< =>x=-\frac{74}{7}\)

Answer 7

\(74 \over -4\)

Answer 8

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