Question

which of the following is not equivalent to 42x + 24? 2(21x + 12) 6(7x + 4) 3(14x + 8) 7(6x + 17)

Explanation:

Step1: Expand 2(21x + 12)

Using distributive property \(a(b + c)=ab + ac\), we get \(2\times21x+2\times12 = 42x + 24\).

Step2: Expand 6(7x + 4)

Using distributive property, we get \(6\times7x+6\times4=42x + 24\).

Step3: Expand 3(14x + 8)

Using distributive property, we get \(3\times14x+3\times8 = 42x+24\).

Step4: Expand 7(6x + 17)

Using distributive property, we get \(7\times6x+7\times17=42x + 119\).

Answer:

7(6x + 17)