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Given
vector P + vector Q = vector R
vector P - vector Q = vector S
let p=vector P,q=vector Q,r=vector R,s=vector S
Calculation
r^2+s^2=[p+q]^2+[p-q]^2
(p+q)^2= p^2+q^2+2pq -----1
(p-q)^2= p^2+q^2-2pq -----2
adding 1 and 2
we get
2p^2+2q^2 = 2(p^2+q^2)
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vector P + vector Q = vector R
vector P - vector Q = vector S
let p=vector P,q=vector Q,r=vector R,s=vector S
Calculation
r^2+s^2=[p+q]^2+[p-q]^2
(p+q)^2= p^2+q^2+2pq -----1
(p-q)^2= p^2+q^2-2pq -----2
adding 1 and 2
we get
2p^2+2q^2 = 2(p^2+q^2)
pls mark as brainliest
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