Question

Joy is solving a quadratic equation of the form
x
2
+
b
x
+
c
=
0
x2+bx+c=0
where
b
b
and
c
c
are integers.
She correctly solves the equation to get
x
=
3
±
√
13
x=3±13
Work out the values of
b
b
and
c
c
.

Answer 1

Step-by-step explanation:

1. What is a redox reaction?

2. What is corrosion? Explain its advantage and disadvantage.

3. What is rancidity? How can we reduce the problem of rancidity?

4. How is corrosion different from rusting?

5. What is meant by endothermic and exothermic reactions? Give suitable example for each.

6. Define different types of chemical reaction and give examples for each.

7. Why is photosynthesis considered as an endothermic reaction?

8. In electrolysis of water, why is the volume of gas collected over one electrode double that of the other electrode?

9. What happens when water is added to solid calcium oxide taken in a container? Write a chemical formula for the same.

10. Give one use of quick lime.

11. Give three types of decomposition reaction.

12. Name the compound used for testing CO2 gas.

13. Explain the process of corrosion and rusting. (2 marks)

14. How is exothermic reaction different from an endothermic reaction? (3 marks)

15. Explain four different types of chemical reaction with suitable examples. (8 marks)

16. How do we balance a chemical equation? (4 marks)

17. Why are oil and fat containing food items flushed with nitrogen? (3 marks)

18. What is the difference between displacement and double displacement reaction? Give suitable chemical equations for the same. (3 marks)

19. Give two uses of quick lime. (2 marks)

20. What is electrolytic decomposition? (2 marks)

21. Identify the following type of reactions:-

▪ Na2SO4 + BaCL2 = BaSO4 + 2NaCL

▪ CaCO3 = CaO + CO2

▪ Fe + CuSO4 = FeSO4 + Cu (3 marks)

Answer 2

Answer:

x^2-6x-4

Step-by-step explanation:

So the equation that she get is x=3±√13

this means that x=3+√13 or 3-√13

which also equals to

x=3+√13

x-3-√13=0

and

x=3-√13

x-3+√13=0

which if you try to find the quadratic equation for this. you need to do it by this

(x-3+√13)(x-3-√13)

which will get you

x^2-6x-4