Question

Find and correct errors of the following mathematical expressions:
$4(x-5)=4x-5$

Answer 1

Let us simplify the $LHS$ first,

$LHS=4(x-5)$

$=4\times x-4\times 5$

$=4x-20$

And,

$RHS=4x-5$

So, we can conclude that,

$LHS\ne RHS$

Here error is that the distributive property of multiplication has not been followed due to which $4$ has been multiplied with $x$ only not with $5.$