Graph the equation y = x2 - 3x -4. For what value or values of x is y = 0

Question

anonymous · Answer

This is asking for the solutions to the quadratic because the solutions are where y = 0. Set y = 0.
$$0 = x^2 - 3x - 4$$Can you factor this?

anonymous · Answer

x2 messing me up is it just x+x-3x-4

anonymous · Answer

No. $$x^2 = x \times x$$

anonymous · Answer

What 2 factors of -4 add up to -3?

anonymous · Answer

-4+1

anonymous · Answer

Alright. Place the factors into their positions.
$$x^2 - 3x - 4 = 0\implies (x - 4)(x + 1) = 0$$Now, remember how 0 times anything equals 0?

anonymous · Answer

4

anonymous · Answer

Alright. That's one value. x = 4.
Now do the same for the other part.
x + 1 = 0
x = ?

anonymous · Answer

sorry this is times so I'm super stressed

anonymous · Answer

No problem.
x = 4, -1
For those values, y is equal to 0.

anonymous · Answer

thank you so much for walking me through it

anonymous · Answer

np :)