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Ex (x+3)la pătrat +2 (x-4)(x+3) +(x-4) la pătrat

Răspuns :

(x+3)^2 + 2(x-4)(x+3) + (x-4)^2
= x^2+6x+9 + 2(x^2+3x -4x-12) + x^2 -8x+16
= x^2+6x+9+2x^2+6x-8x-24+x^2-8x+16
= 4x^2+x-32