if 3x +7y =10 and xy=-1 find the value of 9x^2+49y^2
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(3x + 7y)^2 = 100
9x^2 + 7y^2 + 42(-1)= 100
= 142
Answer is 42
9x^2 + 7y^2 + 42(-1)= 100
= 142
Answer is 42
uma4chanderpeqykp:
its 142 , by mistake u have written 42
Answered by
7
hope it helps you
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the identity of (a+b) sq. = a sq. + bsq. + 2ab
so in the place of ab we had putted value
ya i got it , thanx
ohh k thanx a lot ,thats all bcz i m weak in maths
thanx 4 ur support , i will work hard
hi
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