Question

*Find the roots of the equation x^2 + x - 20 = 0*
1️⃣ ( 4, 5 )
2️⃣ ( 4, - 5 )
3️⃣ ( - 4, 5 )
4️⃣ ( - 4, - 5 )​

Answer 1

Answer:

2. (4,-5)

Step-by-step explanation:

x²+x-20=0

x²+x(5-4)-20=0

x²+5x-4x-20=0

x(x+5)-4(x+5)=0

(x-4)(x+5)=0

x=(4,-5)

Answer 2

Solution :-

→ x² + x - 20 = 0

Splitting the middle term we get,

→ x² + 5x - 4x - 20 = 0

→ x(x + 5) - 4(x + 5) = 0

taking (x + 5) common now,

→ (x + 5)(x - 4) = 0

putting both equal to zero now,

→ x + 5 = 0

→ x = (-5)

and,

→ x - 4 = 0

→ x = 4 .

therefore, the roots of the given equation are (-5) and 4 .

Hence, Option (2) (4, - 5) is correct answer .

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