Page 48 - More Higher algebra

2
+ 2 − 1 = 0
You will recognise the factors of this expression are,

= −1 + √2 and − 1 − √2

= 0.4142, − 2.4142

Confirm this by replacing x in the original expression,

2
1 0.4142 −1
√16 0.4142 − ( )
2

The fx keystrokes for this calculation are,
s16^0.414$$p0.
5^0.414dp1

You can also confirm the result with -2.414.

3. Solve for x,

−3 2 + 5 = 2

Whenever you see an expression like this, let =

2
−3 + 5 = 2
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