x2 - 9x - 10 is equal to :
(x - 10) (x + 1)
(x - 10) (x - 1)
(x + 10) (x - 1)
(x + 10) (x + 1)
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x2 - 9x - 10
= x2 - (10 - 1)x - 10
= x2 - 10x + 1x - 10
= (x2 - 10x) + (1x - 10)
= x (x - 10) + 1(x - 10)
= (x - 10)(x + 1)
Hence, option 1 is the correct option.
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Factorise :
a2 - b2 - 2b - 1
x2 + 6x + 9 - 4y2
x2 - 23x + 42 is equal to :
(x - 21) (x + 2)
(x - 21) (x - 2)
(x + 21) (x + 2)
(x + 21) (x - 2)
(4x2 - 4x + 1) ÷ (2x - 1) is equal to :
2x + 1
2x - 1
none of these