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2x² - 18

Looking at it, you know that the first factors in each set are 2x and x.

(2x ± ?) (x ± ?)

Then guess and check to find 2 factors that when multipled together equal -18, but when plugged into the equation make the original statement true. In this case 6 and 3, however one or the other needs to be negative.

(2x + 6)(x - 3) OR (2x - 6)(x + 3)

Multiply it out to check your answer:

(2x + 6)(x - 3) = 2x² - 6x + 6x - 18

2x² - 6x + 6x - 18 = 2x² - 18

You would get the same result with (2x - 6)(x + 3)

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15y ago
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Q: Factorise 2x to the power 2 -18?
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