Mathematics
8x3 - 18x is equal to:
x(2x + 3) (2x - 3)
2x(3 - 2x) (3 + 2x)
2x(2x + 3) (2x - 3)
x(4x + 6y) (4x - 6y)
Factorisation
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Answer
8x3 - 18x
= 2x (4x2 - 9)
= 2x ((2x)2 - (3)2)
Using the formula
[∵ (x2 - y2) = (x + y)(x - y)]
= 2x (2x - 3)(2x + 3)
Hence, option 3 is the correct option.
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Related Questions
x4 - y4 + x2 - y2 is equal to:
(x + y + 1) (x + y - 1) (x2 + y2)
(x + y) (x - y) (x2 + y2 - 1)
(x + y) (x - y) (x2 + y2 + 1)
none of these
x3 - x2 + ax + x - a - 1 is equal to:
(x — 1) (x2 + a - 1)
(x — 1) (x2 + a + 1)
(x — 1) (x2 - a + 1)
(x — 1) (x2 - a - 1)
x2 - (a - b) x - ab is equal to:
(x - a) (x - b)
(x + a) (x - b)
(x - a) (x + b)
(x + a) (x + b)
Factorise :
8x2y - 18y3