3x Plus 4x [best] <2026 Edition>

3x + 4x = 7x² Why it's wrong: This confuses addition with multiplication. When you multiply 3x * 4x , you get 12x² . But when you add , you do not change the exponent. The exponent only changes when you multiply variables together.

3x + 4x

The two terms are like terms because they both contain the variable x raised to the same power (1). Combine the coefficients: 3 + 4 = 7 Thus: 3x + 4x = 7x 3x plus 4x

But now you know why.

3x + 4x = 7 (dropping the x) Why it's wrong: If you have 3 cats and add 4 cats, you have 7 cats, not just "7." The variable is the noun. Without the "x," the answer is unitless and meaningless in the context of the equation. 3x + 4x = 7x² Why it's wrong: