Question

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Answer 1

c, 3x^2 + 11 y^2-z^2 + 11x^2-5y^2-3z^2
=14x^2+6y^2-4z^2
f, 2/5p^2-5/3p^2+3/8q^2-1/6q^2
=2×3-5×5/15 p^2+ 3×3-1×4/24q^2
= -19/15p^2 - 1/24 q^2
2nd part c, 5x^2+3y^2-4z^2 from - 13 y^2+3z^2-x^2
= -13y^2 + 3z^2-x^2
3y^2 - 4z^2+5x^2
= -16y^2+5z^2-6x^2
3 rd part x^2+20,2x^2+6x+7,5x^2-4x^2+15
perimeter= x^2+20+2x^2+6x+7+5x^2-4x+15
= 8x^2 - 2x+42
7 th part
selling price-profit = cost price
30 x^2+20y+17-15x^2-17y+3
= 15x^2+3y+20
10 th part 9x-6y+8 - 10 x +5y-7
= -x-y+1
then -3x+3y-3 +x+y-1
= -2x+4y-4
hope it helps

Answer 2

Answer:

c, 3x^2 + 11 y^2-z^2 + 11x^2-5y^2-3z^2

=14x^2+6y^2-4z^2

f, 2/5p^2-5/3p^2+3/8q^2-1/6q^2

=2×3-5×5/15 p^2+ 3×3-1×4/24q^2

= -19/15p^2 - 1/24 q^2

2nd part c, 5x^2+3y^2-4z^2 from - 13 y^2+3z^2-x^2

= -13y^2 + 3z^2-x^2

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

= -16y^2+5z^2-6x^2

3 rd part x^2+20,2x^2+6x+7,5x^2-4x^2+15

perimeter= x^2+20+2x^2+6x+7+5x^2-4x+15

= 8x^2 - 2x+42

7 th part

selling price-profit = cost price

30 x^2+20y+17-15x^2-17y+3

= 15x^2+3y+20

10 th part 9x-6y+8 - 10 x +5y-7

= -x-y+1

then -3x+3y-3 +x+y-1

= -2x+4y-4

hope it helps

Step-by-step explanation: