Answer :

While adding any two equations,

Always keep in mind to add like terms.

The remaining terms are kept as it is:

Like terms are those which have same variables and the variables

have same power.

Now in

The coefficient of x

^{2}will be added as:

11 + 6 = 17

The coefficient of x will be added as:

- 8 + 7 = -1

The constant terms will be added as:

4 + (-10) = 4 - 10

= - 6

Hence,

(11x

^{2}- 8x + 4) + ( 6x

^{2}+ 7x - 10)

= 17 x

^{2}- x - 6

Also we can do the addition by the method below:

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