factorise
2 x² + 9x +4
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Answer:
Find 2 values that add to give -9 and multiply to give 2 x 4 = 8.
These values are -1 and -8.
Split the x's.
2
x
2
−
8
x
−
x
+
4
Factorise each half.
2
x
(
x
−
4
)
−
1
(
x
−
4
)
(
2
x
−
1
)
(
x
−
4
)
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