Question

x/3-4x/2+5x/7=21 what is the value of X
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Answer 1

Step-by-step explanation:

Step by Step Solution

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STEP

1

:

Equation at the end of step 1

(((4 • (x3)) + 22x2) - 29x) + 21

STEP

2

:

Equation at the end of step

2

:

((22x3 + 22x2) - 29x) + 21

STEP

3

:

Checking for a perfect cube

3.1 4x3+4x2-29x+21 is not a perfect cube

Trying to factor by pulling out :

3.2 Factoring: 4x3+4x2-29x+21

Thoughtfully split the expression at hand into groups, each group having two terms :

Group 1: -29x+21

Group 2: 4x3+4x2

Answer 2

Answer:

x/3 - 4x/2 + 5x/ 7 = 21

$taking \: lcm \: \\ we \: get \: 42$

14x/42 - 84x/42 + 40x/ 42 = 21

14x /42 - 44x/42 = 21

-30x / 42 = 21

-30 x = 2

x = 15

Hope it helps you