Question

15. Find the sum of x² + x; 6x +9; 8x - y and y + y. del​

Answer 1

Step-by-step explanation:

Answer

In both the condition (a) and (b) the temperature is same.

Therefore, the rate of evaporation will be affected by surface area of water which is in contact of atmosphere.

(a) Rate of evaporation in test tube less than the rate of evaporation in chinca dish.

(b) Rate of evaporation in test tube less than the rate of evaporation in china dish

Answer 2

Step-by-step explanation:

x

2

+6x+9

Comparing x

2

+6x+9 with a

2

+2ab+b

2

, we see that a=x,b=3.

Now, x

2

+6x+9=x

2

+2(x)(3)+3

2

Using, a

2

+2ab+b

2

=(a+b)

2

,a=x and b=3,

we get x

2

+6x+9=(x+3)

2

.

∴ The factors of x

2

+6x+9 are (x+3) and (x+3).