Question

What are the solutions of 4x2 = −20x?

x = 0, x = 5

x = 0, x = −5

x = 4, x = 5

x = 4, x = −5

Answer 1

if you substitute x= a solution
the equality should be true,

Answer 2

the last option i think

Answer 3

\[4x^2 = −20x\]
lets test x=4

does
\[4(4)^2 = −20(4)\]
\[64=-80\]
this is not true so x=4 is not a solution