Question

simplify 4-y²=-y²+4​

Answer 1

$4 - {y}^{2} = - {y}^{2} + 4$

$subtract \: \: 4 - {y}^{2} \: from \: both \: side$

$4 - {y}^{2} - (4 - {y}^{2} ) \\ = - {y}^{2} + 4 - (4 - {y}^{2} )$

simplify:-

$0 = 0$

both sides are equal:-

$y \: \: is \: the \: correct \: ans \:$