(12x-1+2×2)+(x2+4)

Remove parentheses.

12x-1+2×2+x2+4

Add -1 and 4.

12x+2×2+x2+3

Add 2×2 and x2.

12x+3×2+3

Add (12x-1+2x^2)+(x^2+4)

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# Add (12x-1+2x^2)+(x^2+4)

(12x-1+2×2)+(x2+4)

Remove parentheses.

12x-1+2×2+x2+4

Add -1 and 4.

12x+2×2+x2+3

Add 2×2 and x2.

12x+3×2+3

Add (12x-1+2x^2)+(x^2+4)