Question

if X + y equal to 4 and X square + y square equal to 7 then value of xy is​

Answer 1

${ \huge{ \red{ \mathbb{ \ GIVEN}}}}$

${ \large{ \ x + y = 4 }}\\ {x}^{2} + {y}^{2} = 7 \\ xy = ?$

$x + y = 4 (on \: squaring \: both \: sides) \\ {(x + y)}^{2} = {4}^{2} \\ {x}^{2} + {y}^{2} + 2xy = 16 \\ 7 + 2xy = 16 \\ 2xy = 16 - 7 \\ 2xy = 9 \\{ \large{ \blue{ \ xy = \frac{9}{2} }}}$

${\huge\mathcal{\fcolorbox{lime}{black}{\pink{FROM☞ ADESH \: KUMAR}}}}$

Answer 2

Step-by-step explanation:

the answer to this question. is 9/2