Question

*If p = 1 and q = –2 are roots of a quadratic equation, then quadratic equation will be ……………*

1️⃣ x² + 2x –1= 0
2️⃣ x² – x – 2 = 0
3️⃣ x² – 2x + 1= 0
4️⃣ x² + x + 2 = 0​

Answer 1

Step-by-step explanation:

Given,

zeroes of the equation is -1 and 2

To find,

quardratic equation is =?

Solution,

Sum of zeroes =p+q

=1+ (-2)

= -1

Product of zeroes = pq

= 1 × -2

= -2

Therefore,

[x2 - (sum of zeroes)x + product of zeroes]k

[x2 - (-1)x + (-2)] 1

Therefore our equation is x2 - x -2

hope this will help you