JEE MATHEMATICS MCQ: QUADRATIC EQUATIONS

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Analyzing +4 | -1

If the equation

a{x^2} + 2bx + 3c = 0\;\,\mathrm{and}\;3{x^2} + 8x + 15 = 0

have a common root, where

a,\;b,\;c

are the lengths of the sides of a

\Delta ABC

, then

{\sin ^2}A + {\sin ^2}B + {\sin ^2}C

is equal to

View answer and explanation

Correct option: D

Option B

\left( {x - c} \right)\left( {x - d} \right) + k = 0

is correct because if c and d are roots of (x-a)(x-b) - k = 0, then (x-a)(x-b) - k = (x-c)(x-d). Thus, (x-c)(x-d) + k = (x-a)(x-b), implying a and b are roots of (x-c)(x-d) + k = 0.

More Questions from QUADRATIC EQUATIONS

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The solution of the equation

\log _7 \log _5(\sqrt{x+5}+\sqrt{x})=0

is If

\alpha ,\beta

are the roots of

{x^2} - 3x + a = 0,a \in R

and

\alpha < 1 < \beta ,

then If

\alpha ,\;\beta

be the roots of the equation

{x^2} - px + q = 0

and

{\alpha _1},{\beta _1}

be the roots of the equation

{x^2} - qx + p = 0,

then the equation whose roots are

\frac{1}{{{\alpha _1}\beta }} + \frac{1}{{\alpha {\beta _1}}}\mathrm{and}\;\frac{1}{{\alpha {\alpha _1}}} + \frac{1}{{\beta {\beta _1}}},

is If

{x^2} + 4ax + 2 > 0

for all values of

x

, then

a

lies in the interval If

f\left( x \right) = a{x^2} + bx + c\;

and

\;f\left( { - 1} \right) < 1,f\left( 1 \right) > - 1,f\left( 3 \right) < - 4\;

and

\;a \ne 0,

then Root(s) of the equation

9{x^2} - 18\left| x \right| + 5 = 0

belonging to the domain of definition of the function

f\left( x \right) = \log \left( {{x^2} - x - 2} \right)

is (are)