Question

Dados os polinômois A= x2-3×+5,B=×2+2×-4ec =x2+5+×-1, Calcule: a)A+B;
b)A+B+C;
c)A+C;
d)B+C.​

Answer 1

A)

A+B=(x²—3x+5)+(x²+2x—4)

=x²—3x+5+x²+2x—4

=2x²—3x+2x+5—4

= 2x²—x+1

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A+B+C=(x²—3x+5)+( x²+2x—4)+(x²+5+x—1)

=x²—3x+5+x²+2x—4+x²+5+x—1

=x²+x²+x²—3x+2x+x+5—4+5

=3x²+6

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A+C=(x²—3x+5)+(x²+5+x—1)

=x²—3x+5+x²+5+x—1

=2x²—3x+x+5+5—1

=2x²—2x+9

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B+C=(x²+2x—4)+(x²+5+x—1)

=x²+2x—4+x²+5+x—1

=2x²+3x—4+5—1

=2x²+3x+1—1

=2x²+3x

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