60 + 11x - x2 is equal to :
(4 + x) (15 - x)
(4 - x) (15 - x)
(4 - x) (15 + x)
(4 + x) (15 + x)
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60 + 11x - x2
= 60 + (15 - 4)x - x2
= 60 + 15x - 4x - x2
= 15(4 + x) - x(4 + x)
= (4 + x)(15 - x)
Hence, option 1 is the correct option.
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(4x2 - 4x + 1) ÷ (2x - 1) is equal to :
2x + 1
2x - 1
none of these
(x + y)2 - 3(x + y) - 4 is equal to :
(x + y + 4) (x + y - 1)
(x + y + 4) (x + y + 1)
(x + y - 4) (x + y + 1)
(x + y - 4) (x + y - 1)
Factorise :
a2 + 5a + 6
a2 - 5a + 6