Here's the question you clicked on:
melodylovesunicorns
Solve the quadratic equation y2 - 5y = -4 by factoring
add 4 to both sides first.
add the 4 and set it equal to zero. So: \[y^2-5y+4=0\]
You're next step is to find two numbers(a and b) when multiplied give you -5, but when added result in +4. Those two numbers will make up: \[(x \pm a )(x \pm b) \] where a and b are real numbers.
It's the other way around. When you multiply them you get +4 and when you add them you get -5
Thank you so much!