Question

How do I find the zeros of 2x^2+2x-4

Answer 1

look at the signs in front of each term so +2x^2, +2x, and -4. + to +, there is no change, but from + to - there is a change, so 1 zero

Answer 2

graph it

Answer 3

factor it and find zeros.

Answer 4

http://fooplot.com/#W3sidHlwZSI6MCwiZXEiOiIyeF4yKzJ4LTQiLCJjb2xvciI6IiMwMDAwMDAifSx7InR5cGUiOjEwMDAsIndpbmRvdyI6WyItMTIuOTk5OTk5OTk5OTk5OTg2IiwiMTIuOTk5OTk5OTk5OTk5OTg2IiwiLTcuOTk5OTk5OTk5OTk5OTkxIiwiNy45OTk5OTk5OTk5OTk5OTEiXX1d

Answer 5

\(\large {2x^2+2x-4\implies 2x^2+2x-4=0\implies 2({\color{brown}{ x^2+x-2}})=0
\\ \quad \\
\begin{array}{llll}
{\color{brown}{ x^2\quad +x\quad -2}}\\
\qquad \quad \uparrow \qquad \uparrow \\
\qquad 2-1\quad 2\cdot -1
\end{array} }\)