Question

x = – 9 is the solution of (a) 3x2 – 27 = 0 (b) 3x2 – 243 = 0 (c) x2 + 9 = 0 (d) 3x2 – 81 = 0

Answer 1

Answer is option (B)

Explanation:-

• x=-9

• 3(-9)²-243

• 3(81)-243

• 243-243

• =0

Hope it helps u...

Answer 2

✯✯ QUESTION ✯✯

x = – 9 is the solution of : -

(a) 3x² – 27 = 0

(b) 3x² – 243 = 0

(c) x² + 9 = 0

(d) 3x² – 81 = 0

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✰✰ ANSWER ✰✰

1. 3x²-27=0

➮Putting x = -9 : -

$\longmapsto\tt{3{(-9)}^{2}-27=0}$

$\longmapsto\tt{3(81)-27=0}$

$\longmapsto\tt{243-27=0}$

$\longmapsto\tt{216≠0}$

➥No ,x=-9 is not a solution of 3x²-27...

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2. 3x²-243=0

➥Putting x = -9 : -

$\longmapsto\tt{3{(-9)}^{2}-243=0}$

$\longmapsto\tt{3(81)-243=0}$

$\longmapsto\tt{243-243=0}$

$\longmapsto\tt{0=0}$

➥Yes , x = -9 is a solution of 3x²-343..

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3.x²+9=0

➮Putting x = -9 : -

$\longmapsto\tt{{(-9)}^{2}+9=0}$

$\longmapsto\tt{81+9=0}$

$\longmapsto\tt{90≠0}$

➥No , x = -9 is not a solution of x²+9..

_______________________

4. 3x²-81=0

➮Putting x = -9 : -

$\longmapsto\tt{3{(-9)}^{2}-81=0}$

$\longmapsto\tt{3(81)-81=0}$

$\longmapsto\tt{243-81=0}$

$\longmapsto\tt{142≠0}$

➥No , x = -9 is not a solution of 3x²-81..

☛So , Option b. is Correct...

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