<p>Do you need to know imaginary numbers on the SAT? Quadratic Formula? What about ACT?</p>
<p>Quadratic formula is useful though they usually make the problems solveable without it. Imaginary numbers aren’t on it.</p>
<p>You <em>might</em> have to know about imaginary numbers on the ACT, though… I don’t recall ever seeing them. They aren’t that difficult anyways.</p>
<p>^There’s usually one fairly basic question about them on each ACT test.</p>
<p>I have seen imaginary numbers on the ACT…it might have been an old ACT retired test that is now used for practice. If it is on the ACT, it will be one question adn it probably won’t be on there.</p>
<p>The ACT does ask about imaginary #'s.
I don’t know about the SAT though.</p>
<p>You don’t even need basic knowledge of imaginary numbers. If you have a graphing calculator, depending on the version, go to mode, change from “real” to “a+bi” then you can use the imaginary number function on your calculator i.e do exponents, operations, etc. For me, the button "i"is towards the bottom of my calculator.</p>
<p>If you have a ti-84 calculator you can enter the problem verbatim and get the correct answer… now only if we could use a ti-89 on the act :D</p>
<p>On the SAT before the math section it says
“All numbers are real numbers” So no imaginaries
I’ve never taken ACT before.</p>