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D. (3x² + 10w + 8) square inches

Step-by-step explanation:

the new width of the rectangle: w + 2

the new length of the rectangle: 3w + 4

the area: (w + 2)(3w + 4) = 3w² + 10w + 8

let's solve your equation step-by-step.

4x+2=2x+12

step 1: subtract 2x from both sides.

4x+2−2x=2x+12−2x

2x+2=12

step 2: subtract 2 from both sides.

2x+2−2=12−2

2x=10

step 3: divide both sides by 2.

2x

2

=

10

2

x=5

step-by-step explanation: