(8
a: 8 x
2 +8x
3
please solve
Answers
Answered by
1
Answer:
40 is the answer for this question
Answered by
0
Step-by-step explanation:
Put the equation in form
x
2
−
8
x
+
3
=
0
From here we have two options:
Option a) Use the solutions formula for 2nd degree equations
x
=
−
b
±
√
b
2
−
4
a
c
2
a
for a equ in the canonic form
a
x
2
+
b
x
+
c
=
0
On this way:
x
=
8
±
√
64
−
12
2
=
8
±
√
4
⋅
13
2
=
4
±
√
13
Option b) complete the square
x
2
−
8
x
+
3
=
(
x
−
4
)
2
−
16
+
3
=
(
x
−
4
)
2
−
13
=
(
x
−
4
+
√
13
)
(
x
−
4
−
√
13
)
from here the solutions are
4
±
√
13
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