Krishna
0

(a)

Step 1: Note-down the given quadratic equation and compare it with the standard form ax^2 + bx + c

EXAMPLE: kx^2+4x+(5-k)

ax^2 + bx + c

Where a = k, b = 4 and c = (5 - k)

Step 2: Look the hints given in the question according to that hints choose the discrimination( b^2-4ac ) of the equation.

HINTS:1) b^2 - 4ac > 0 (Positive), there are 2 real solutions

2) b^2-4ac = 0 (Zero), there is one real solution

3) b^2-4ac < 0 (Negative), there are 2 complex solutions or no real roots.

EXAMPLE: HINT: Has 2 different real solutions

So we have to take the discrimination of b^2-4ac>0

Step 3: Substitute all the values of a, b and c in the suitable discrimination.

EXAMPLE: $(4)^2-4[k][(5-k)]>0$

Step 4: Simplify the inequality to find the quadratic equation

EXAMPLE: 16\ -\ 20k\ +4k^2\ >\ 0

take 4 as common

k^2\ -5k\ +4\ >\ 0

Step 5: Verify that the result(in step 4) is satisfying the given answer or not.

(b)

Step 6: Simplify the inequality to find the unknown value.

NOTE: Apply inverse operations on both sides, for linear equations.

Apply the factorization method for the quadratic equation.

EXAMPLE: 9 + 8k + 8 <0

8k+17<0

8k < -17

k\ <\ \frac{-17}{8}