Question

Simplify and verify
(p²+q²+r²) (pq+qr); p=2 ,q=-3,r=1​

Answer 1

Step-by-step explanation:

step 1

putting p=2,q=3,r=1 in the equation we get

step 2

(2^2+(-)3^2+1^2)*(2×(-)3+(-3×1))

= 14×-9

= -126

Answer 2

Step-by-step explanation:

P=2

Q=3

R=1

={(2*2)+(3*2)+(1*2)}{(2*3)+(3*1)}

={4+6+2}{6+3}

=12*9

=108