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If one of the factor of x2 + x – 20 is (x + 5). Find the other
- a)x – 4
- b)x + 2
- c)x + 4
- d)x – 5
Correct answer is option 'A'. Can you explain this answer?
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If one of the factor of x2+ x – 20 is (x + 5). Find the othera)x...
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If one of the factor of x2+ x – 20 is (x + 5). Find the othera)x...
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If one of the factor of x2+ x – 20 is (x + 5). Find the othera)x...
Hi!
Let's use the splitting the middle term method to solve this.
x
x^2+x-20
We need to find two numbers that add up to x and -20 (don't forget the signs!)
Our numbers will be => -4 and 5
=> x^2 + 5x - 4x - 20
=>x(x+5) - 4(x+5)
=>(x-4)(x+5)
(x+5) is already present in the question. The other factor will be (x-4).
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