Question

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Answer 1

Respuesta:

1) P(2x+1)=4x^2-x+1

Sea x=1/2

P(2(1/2)+1)=4(1/2)^2-(1/2)+1

P(2)=1-(1/2)+1

P(2)=3/2

2) 7^(x-5)=49(7)

7^(x-5)=343

7^(x-5)=7^3

x-5=3

x=8

3) (x^(4m-3) × x^(7m-8))÷x^(11m-15)

(x^(4m-3+7m-8)) ÷ x^(11m-15)

x^(11m-11) ÷ x^(11m-15)

x^(11m-11-(11m-15))

x^(11m-11m-11+15)

x^4

4) (4(5m)(6n)) ÷ 60

120mn÷60 = 2mn

5) a+b-2=0 => a+b=2

b+c-3=1 => b+c=4

a+c-4=2 => a+c=6

a=2, b=0, c=4

Piden suma de coeficientes:

(2a-1)+(2b+3)+(2c+5)

(2(2)-1)+(2(0)+3)+(2(4)+5)

3 + 3 + 13 = 19