Question

solve these 3 Questions please.. Chapter Algebraic expressions..​

Answer 1

Step-by-step explanation:

7. First add

10p-r + 5p+q = 15p+q-r ---- 1

Then subtract

15p+q-r - (p-2q+r)

= 15p+q-r-p+2q-r

= 14p+3q-2r answer

8. In this

3x-y+11 +(-y-11)

3x-y+11 +(-y-11)= 3x-2y ----- 1

then subtract

3x-2y -(3x-y-11)

3x-2y -(3x-y-11)= 3x-2y -3x+y+11

3x-2y -(3x-y-11)= 3x-2y -3x+y+11= -y+11 answer

9. In this question

4+3x +5-4x+2x^2

4+3x +5-4x+2x^2=2x^2-x+9 ------ 1

Then add the other 2

3x^2-5x +(-x^2+2x)

3x^2-5x +(-x^2+2x)= 2x^2-3x ------ 2

then subtract 2 from 1

2x^2 - x + 9 - (2x^2 -3x)

2x^2 - x + 9 - (2x^2 -3x)= 2x^2-x+9-2x^2+3x

2x^2 - x + 9 - (2x^2 -3x)= 2x^2-x+9-2x^2+3x= 2x+9 answer

Hope it helps !!!

Answer 2

Step-by-step explanation:

Q1)=10p-r+5p+2q

15p+2q-r-(p-2q+r)

15p+2q-r-p+2q-r

=14p+4q-2r

Q2)3x-y+11+(-y-11)

3x-y+11-y-11

=3x-2y

3x-2y-(3x-y-11)

=-y+11

Q3)4+3x+5-4x+2x^2

=9-x+2x^2----eq-1

3x^2-5x+(-x^2+2x)

3x^2-5x-x^2+2x

=2x^2-3x----eq-2

Subtracting eq-1 and 2,

9-x+2x^2-(2x^2-3x)

9-x+2x^2-2x^2+3x

=9+2x

Hope it helped!