Question

The root of the equation(2x – 1) + (x – 1) = x + 2 is (a) 1 (b) 2 (c) -1 (d) -2​

Answer 1

Answer:

Correct option is

B

−2α(α+1)

C

4α3−3α

Given:2x(2x+1)=1i.e.4x2+2x−1=0

Let the other root be α,β

2α(2α+1)=1⇒21=α(2α+1)−(1)

⇒α+β=4−2

=−21

β=−21−α

=−α(2α+1)−α

=−2α2−α−α

=−2α2−2α

=−2α2−2α=−2α(α+1)−(B)

=α(−2α−2)

α(4α2−3)[∵4α2+2α−1=0⇒−2α=4α2−1⇒−2α−2=4α2−

Answer 2

Answer:

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