Question

if x=1/2-root 3, find the value of x cube-2x square- 7x+5​

Answer 1

Answer:

x^3-2x^2-7x+5

(1/2√3)^3-2(1/2√3)^2-7×1/2√3+5

1/24√3-1/6-7/2√3+5

1/√3(1/24-7/2)-(1/6-5)

1/√3(-83/24)-(29/6)

-1/6(83/4√3+29)

-1/6(83+116√3/4√3)

-1/24√3(83+116√3)

Answer 2

Answer:

Hi

Step-by-step explanation:

Ans.

Sodium carbonate + Ethanoic acid → Sodium ethanoate + Carbon dioxide + Water

5.3 g + 6 g → 8.2 g + 2.2 g + 0.9 g

LHS RHS

11.3 g = 11.3 g

(Mass of reactant) (Mass of product)

This shows, that during a chemical reaction mass of reactact = mass of product.