:दो वास्तविक संख्याओं का अन्तर 7 है। यदि इनके वर्गो का अन्तर 210 है, तो उन दोनो वास्तविक संख्याओं का योग है
a.30
b.40
c.50
d. n.o.t
Answers
Answered by
1
x-y=7
x²-y²=210
x=7+y
[y+7]²+y²=210
y²+49+14y-y²=210
49+14y=210
14y=161
y=11.5
x=7+11.5=18.5
then x+y=18.5+11.5=30answea
x²-y²=210
x=7+y
[y+7]²+y²=210
y²+49+14y-y²=210
49+14y=210
14y=161
y=11.5
x=7+11.5=18.5
then x+y=18.5+11.5=30answea
dk906755pdkgfe:
short trick h kya
Answered by
1
let the two nos be a and b( let a be greater)
given
a-b=7 ....eq(1)
a^2-b^2=210
(a-b)(a+b)=210
7(a+b)=210
a+b=30
this is the shortest method
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