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The sum of a and b will be the coefficient of the x term of the trinomial. This can be seen below.

(x + a)(x + b)
= x² + bx + ax + ab
= x² + (a+b)x + ab

x is being multiplied by both a and b individually and the products are being added, so sum of a and b appears as the coefficient of x term.

Thus the answer to this question is option C

3125000 liter

Step-by-step explanation:

Given: A pool that is 50 m long, 25 m wide, and 2.5 m deep.

To Find: How much water does it take to completely fill the pool.

Solution:

length of pool

breadth of pool

depth of pool  

Now,

as the given pool has cuboidal dimensions,

Volume of pool  

putting values

                             

                             

Now,

as can hold water

                   

total water it takes to fill the pool completely      

                                                     

It takes water to fill the pool completely.