Question

X2+5x-14=0, x=root 2,-7,3​

Answer 1

Step-by-step explanation:

taking LHS,

4 +10 -14

0 = RHS

Answer 2

Answer:

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Step-by-step explanation:

Sol. a) By putting x = √2 in L.H.S. we get

L.H.S. = ( √2 )2 + 5( √2 ) – 14

= 2 + 5√ 2 – 14

= 5 √2 – 12

≠ R.H.S.

∴ L.H.S. ≠ R.H.S.

Thus equation is not satisfied.So, √2 is not the root of the given quadratic equation.

b) By putting x = –7 in L.H.S. we get

L.H.S. = (–7)2 + 5(–7) – 14

= 49 – 35 – 14

= 49 – 49

= 0

= R.H.S.

∴ L.H.S. = R.H.S.

Thus equation is satisfied.

So, –7 is the root of the given quadratic equation.