Question

Plz Solve It Fast I need It​

Answer 1

Answer:

+13 or -13

Step-by-step explanation:

so here's the answer

lets use (a+b+c)² formula

(x+y+z)²=x²+y²+z²+2xy+2yz+2xz

=(x²+y²+z²)+2(xy+yz+xz)

=115+2(27)

=169

(x+y+z)=root of 169

=+or-13

therefore x+y+z=+13 or -13

Answer 2

Answer:

hey mate the answer is option b.

Step-by-step explanation:

(x+y+z)^2=x^2+y^2+z^2+2(xy+yz+zx)

So we substitute.

(x+y+z)^2=115+2(27)

(x+y+z)^2 =169

So the answer is √169=13