Simplify (7x^2− 2x + 9) + (3x^2+ 15x − 4).

The simplified answer is:   " 10x² + 13x + 5 " .

Explanation:

Given:

 
 (7x²− 2x + 9) + (3x²+ 15x − 4) ;

→ Rewrite as:   (7x²− 2x + 9) + 1(3x²+ 15x − 4)

Considering the following portion of the expression:

   "  1(3x²+ 15x − 4) " ;

Note the "distributive property of multiplication" :

  a(b + c) = ab + ac ;

  a(b − c) = ab + ac ;

Likewise:

 a(b + c − d) = ab + ac − ad ;

   So;       1(3x²+ 15x − 4) = (1*3x²) + (1*15x) − (1*4)  ; 

               =  3x² + 15x − 4

Bring down the: "(7x²− 2x + 9)" ;  and rewrite the expression:


          7x² − 2x + 9 + 3x² + 15x − 4 ;

Combine the "like terms" :

  +7x² + 3x² =  + 10x² ;

  - 2x + 15x = + 13x ; 
 
  + 9 − 4 = + 5 ; 

and rewrite the expression:

   which is:   " 10x² + 13x + 5 " .

Hello!

the answer is:

the answer is:

why?

to solve the problem, we need to remember the quotient of power property, it's defined by the following relation:

if we have a quotienf of powers that have the same base, we need to keep the same base and subtract the exponent of the denominator power to the exponent of the numerator power.

so, we are given the expression:

then, calculating we have:

hence, the answer is:

have a nice day!