20x square +21x -5 =0 factorisation method
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Answered by
1
Answer:
Step-by-step explanation:
Given equation is 20x²+21x-5=0
=>20x²+25x-4x-5=0
=>20x²-4x+25x-5=0
=>4x(5x-1)+5(5x-1)=0
=>(5x-1)(4x+5)=0
(5x-1)=0 or 4x+5=0
=>5x=1
=>x=1/5
4x+5=0
=>4x=-5
=>=-5/4
Roots of the given equation are 1/5 and -5/4
Answered by
1
Step-by-step explanation:
20x²+21x-5=0
Let factorise it by spilliting middle term
- 5 is smaller than 21x so we multiply (20×5=100) it for making larger than 21x
hence,
20x² + (25-4)x-5
20x²+25x-4x-5
5x(4x+5) -1(4x+5)
(5x-1) (4x+5) = 0
5x-1=0
5x=1
x = 1/5
4x+5 =0
4x=-5
x= -5/4
Roots of the equation are 1/5 and -5/4
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