Find the value of 81 - 4x² for x = 4 please help me ☹︎
Answers
Answered by
1
81
−
4
x
2
Rewrite
81
as
9
2
.
9
2
−
4
x
2
Rewrite
4
x
2
as
(
2
x
)
2
.
9
2
−
(
2
x
)
2
Since both terms are perfect squares, factor using the difference of squares formula,
a
2
−
b
2
=
(
a
+
b
)
(
a
−
b
)
where
a
=
9
and
b
=
2
x
.
(
9
+
2
x
)
(
9
−
(
2
x
)
)
Multiply
2
by
−
1
.
(
9
+
2
x
)
(
9
−
2
x
)
Answered by
1
Step-by-step explanation:
the value of the given equation is
17
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