A+b=1,a-b=7.find a2+b2
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Answered by
79
=>
(a+b)^2=a^2+b^2+2ab. ...(i)
=>
(a-b)^2=a^2+b^2-2ab ...(ii)
Adding (i) and (ii)
=>(a+b)^2+
(a-b)^2=2(a2+b2)+2ab-2ab
=>1^2+7^2=2(a2+b2)
=>1+49=2(a2+b2)
=>50/2=(a2+b2)
.˙.(a2+b2)=25
If it helped u then mark it as brainliest
(a+b)^2=a^2+b^2+2ab. ...(i)
=>
(a-b)^2=a^2+b^2-2ab ...(ii)
Adding (i) and (ii)
=>(a+b)^2+
(a-b)^2=2(a2+b2)+2ab-2ab
=>1^2+7^2=2(a2+b2)
=>1+49=2(a2+b2)
=>50/2=(a2+b2)
.˙.(a2+b2)=25
If it helped u then mark it as brainliest
Answered by
5
Answer:
a2 + b2 = 25
Step-by-step explanation:
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