If (2x-3y)=10&XY=8 then find value of 4x²+9y²
Answers
Answered by
3
Step-by-step explanation:
2x-3y=10 (squaring both side)
4x^2+9y^2-12xy=100
4x^2+9y^2=100+12(8)
4x^2+9y^2=196.ans.
Answered by
8
Step-by-step explanation:
(2x-3y) =10,xy=8
(2x-3y)²=(10)²
so, it is in the form of(a-b)²=a²+b²-2ab
(2x) ²+(3y) ²-2(2x)(3y) =100
4x²+9y²-12xy=100
4x²+9y²-12(8)=100
4x²+9y²-96=100
4x²+9y²=196
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