does 3X × 4X = 12X or 12X(to the power of 2)?
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It'd be 12X(to the power of 2), because you're multiplying the X's as well as the integers.
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3x + 4x = 12x
BUT
3x × 4x = 12x^2
BUT
3x × 4x = 12x^2
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3X * 4X = 12X^2
3X + 4X = 12X
3X + 4X = 12X
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12X to the power of two