Question

i need help .. can you teach me how to get the checking of this problem ? 2x²-3x-9=0

i know the answer of that but i don't know how to check if it is right or wrong please help me :D

Answer 1

substitute in the origin equation \[2x ^{2}-3x-9=??\]
if the answer is zero then you are right

Answer 2

\(\Huge\bf \color{orange}{Welcome~to~OpenStudy!!}\hspace{-310pt}\color{cyan}{Welcome~to~OpenStudy!!}\hspace{-307.1pt}\color{midnightblue}{Welcome~to~\color{purple}{Open}}\color{blue}{Study!!}\)

Answer 3

Tell us what you got:D

Answer 4

2x^2 - 3x -9
1 -3
2 3
cross multiply
1*3=3 and 2 * -3 = -6
then add
3 - 6 = -3
well its correct
the answer will be (x - 3)(2x + 3)
x= 3 and -3/2

Answer 5

If you have found the x values, plug them in to the equation to make sure you get zero for both values.