Question

Help please In return I will give you brainliest

Answer 1

Answer:

Hopes it helps

please mark as brainliest

Answer 2

Answer:

Step-by-step explanation:

1.) x = -2

y = -1

z = 3

$x^{2}$+$y^{2}$+$z^{2}$-xy-yz-zx

($-2^{2}$)+($-1^{2}$)+($3^{2}$)-(-2*-1)-(-1*3)-(3*-2)

4+1+9-2+3+6

= 21

2.) P+Q+R

$7x^{2}$+ 5xy-$9y^{2}$+$4y^{2}$-$3x^{2}$-6xy$-4x^{2}$+xy+$5y^{2}$

= 0

Plzzzzzzz mark me as BRAINLIEST...........................