if 9x^2+25y^2=94 and xy = -3 then what is the value of 3x + 5y? fastfastfast
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Step-by-step explanation:
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Step-by-step explanation:
squaring (3x+5y)
we will apply the formula of a²+b²+2ab
(3x+5y)² = (3x)² + (5y)² + 2(3x)(5y)
=9x²+25y²+30xy
as we know that 9x²+25y²=94;xy = -3
then, 9x²+25y²+30xy
94+30(-3)
94-90
4.
(3x+5y)²= 4
3x+5y=√4
=2
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