Factorise 2x² - 7x-15
Answers
Answered by
25
2x^2-7x-15
2x^2-10x+3x-15=0
2x(x-5)+3(x-5)=0
(2x+3)(x-5)=0
x=-3/2 or x=5
2x^2-10x+3x-15=0
2x(x-5)+3(x-5)=0
(2x+3)(x-5)=0
x=-3/2 or x=5
Answered by
19
Hi dear !
nice question
given,
2x^2 - 7x - 15
=> 2x^2 - ( 10 - 3 )x - 15
=> 2x^2 - 10x + 3x - 15
=> 2x ( x -5 ) + 3 ( x - 5 )
=> ( x - 5 ) ( 2x + 3 )
either,
x - 5 = 0 or 2x + 3 = 0
=> x = 5 => x = -3/2
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
nice question
given,
2x^2 - 7x - 15
=> 2x^2 - ( 10 - 3 )x - 15
=> 2x^2 - 10x + 3x - 15
=> 2x ( x -5 ) + 3 ( x - 5 )
=> ( x - 5 ) ( 2x + 3 )
either,
x - 5 = 0 or 2x + 3 = 0
=> x = 5 => x = -3/2
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Similar questions