factorise 121 x² -22x 1
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Answered by
0
Answer:
The right side of the equation is a special form of quadratic:
a
2
−
b
2
=
(
a
+
b
)
(
a
−
b
)
Let
a
2
=
121
x
2
then
a
=
√
121
x
2
=
11
x
Let
b
2
=
1
then
1
=
√
1
=
1
Substituting gives:
121
x
2
−
1
2
⇒
(
11
x
+
1
)
(
11
x
−
1
)
We can then write the equation factored as:
y
=
(
11
x
+
1
)
(
11
x
−
1
)
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