Question

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8. Which of the following equations is not equivalent to
7(3x - 2) = -4(6 - 5x)?
a. X = 10
b. X - 10 = 0
C. X - 14 = -24
d. 21x - 14 = -24 + 20x
1
I

Answer 1

a and b

Explanation:

Solve for x: 7(3x - 2) = -4(6 - 5x)

Expand the brackets:

⇒ 21x - 14 = -24 + 20x (therefore it is equivalent to d)

Subtract 20x from both sides:

⇒ x - 14 = -24 (therefore it is equivalent to c)

Add 14 to both sides:

⇒ x = -10 (therefore, it is NOT equivalent to a)

Add 10 to both sides:

⇒ x + 10 = 0 (therefore, it is NOT equivalent to b)