Use the quadratic formula to find:
x
=
1
±
√
85
5
Explanation:
2
−
10
12
is of the form
a
+
b
c
with
,
and
This has discriminant
Δ
given by the formula:
4
(
)
×
100
240
340
⋅
This is positive, but not a perfect square, so the quadratic equation has a pair of irrational roots, given by the quadratic formula:
Answer:
x=4
Step-by-step explanation: