Question

dados A = 3x + 4, B= x²+ 2 x + 5 e C= x² + x + 3, efetue as multiplicações no caderno.

(a) A×C
(b) B×C
(c) C×C

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Answer 1

Resposta:

(a) A×C

(3x + 4) . (x² + x + 3)

$3x^{3}$ +$3x^{3} + 3x^{2} + 9x + 4x^{2} +4x+12$

$3x^{3} + 7x^{2} +13x +12$

(b) B×C

(x²+ 2 x + 5 ) . (x² + x + 3)

$x^{4} + x^{3} + 3x^{2} +2x^{3} +2x^{2} + 6x+ 5x^{2} +5x+15$

$x^{4} +3x^{3} +10x^{2} +11x +15$

(c) C×C

(x² + x + 3) . (x² + x + 3)

$x^{4} + x^{2} + 9 +2x^{3} +6x^{2} +6x$

$x^{4} + 2x^{3} + 7x^{2} +6x+9$