if a+b=13,a-b=11 find value of a^2+b^2 i am not being able to find it
if a+b=13,a-b=11 find value of a^2+b^2 i am not being able to find it
kyra arora , 7 Years ago
Grade 9
9 grade maths> if a+b=13,a-b=11 find value of a^2+b^2 i ...
2 Answers
Arun
Last Activity: 7 Years ago
Dear student
In squaring both the equations
a² + b² + 2ab = 169
&
a² + b² - 2ab = 121
Now add
2(a² + b²) = 290
Hence
a² + b² = 145
Regards
Arun (askIITians forum expert)
Sidhant
Last Activity: 7 Years ago
In sq both equationa^2+b^2+2ab=169anda^2+b^2-2ab=121Now add2(a^2+b^2) =299ans Thanks Sid margin Student in little angel high sec schoolDelhi India near red fort
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