Question

Find the answer of the following:

Answer 1

the total answer is 2

$5 {x}^{2} + 4 {y}^{2} + 3 y - 4xy + 5x - 3$

is the answer

Answer 2

Answer:

Step-by-step explanation:

a) Given expressions

7xy+5yz-3zx, 4yz+9zx-4y and -3xz+5x-2xy

Let a= 7xy+5yz-3zx  

      b=4yz+9zx-4y

      c= -3xz+5x-2xy

Addition of the three expressions a,b,c is

a+b+c = 7xy+5yz-3zx+4yz+9zx-4y-3xz+5x-2xy

          = 5xy+9yz+3zx-4y+5x

b) Given expressions

$5x^{2}-4y^{2} +6y-3 , 7x^{2} -4xy +8y^{2} +5x-3y$

Let c1=  $5x^{2}-4y^{2} +6y-3$

      c2= $7x^{2} -4xy +8y^{2} +5x-3y$

we need to subtract  c1 from c2

therfore C2-C1= ($7x^{2} -4xy +8y^{2} +5x-3y$) - ($5x^{2}-4y^{2} +6y-3$)

                        = $2x^{2} -4xy +12y^{2} +5x-9y +3$