Question

Which is the set of roots for the equation? x2 + 3x - 8 = 0
a: {18,-1}
b: {-6,3}
c: {-2,9}
d: {9}

Answer 1

I think the equation should be

\[x^2 + 3x - 18 = 0\]

is that correct..?

Answer 2

i think

Answer 3

yeah it should

Answer 4

Which is the set of roots for the equation? x2 + 3x - 18 = 0
a: {18,-1}
b: {-6,3}
c: {-2,9}
d: {9}

Answer 5

what do you guys think

Answer 6

hint: \(\large \begin{array}{cccllll}
x^2&+3x&-18\\
&\uparrow &\uparrow \\
&6-3&6\cdot -3
\end{array}\)

Answer 7

so b

Answer 8

well.. try those 2 roots in "b", see if they work

Answer 9

have you covered factoring of quadratics yet?