Question

i. Which of the following quadratic equations has roots 2, -1? (A) x2 + x + 2 = 0 (B) x2 - X-2 = 0 (C) x2 + 2x - 2 = 0 (D) x2 -2x +2 = 0​

Answer 1

Answer:

In the equation B , it had 2,-1

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Answer 2

Answer:

The quadratic equation is x²-x-2=0

Step-by-step explanation:

Given : the roots of the equation is given as 2,-1

so the formation of quadratic equation whose roots are given can be written as

x²-(sum of roots)x + (product of roots) =0

∵sum of roots = 2-1 = 1

 product of roots= 2×(-1)= -2

so the equation we get

x²-x-2=0

So , the option C is correct