Question

Determine the value of "r" such that the solutions to the equation are -10 and 10 x^2 - r = 0

Answer 1

`x^2-r=0`

if x = 10 is a solution to the equation, then:

`\begin{gathered} 10^2-r=0 \\ 100-r=0 \\ 100=r \end{gathered}`

If x = -10 was used, the result would be the same, then the solution is r = 100