Question

Value of 'a' if the expression x²+3x-a =3 for x=2 is -------.

6

5

7

4

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Answer 1

Step-by-step explanation:

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Answer 2

Answer :

Value of 'a' if the expression x² +3x-a =3 for x=2 is 7 .

Option c. [ 7 ] is the correct answer.

Step-by-step explanation :

x² + 3x - a = 3

Given that, x = 2

Therefore, by putting the values,

⟹ x² + 3x - a = 3

⟹ 2² + 3*2 - a = 3

⟹ 4 + 6 - a = 3

⟹ 10 - a = 3

⟹ - a = 3 - 10

⟹ - a = - 7

Eliminating ( - ) minus sign from both sides

⟹ a = 7

Hence, the required number is 7

Now, Verification

⟹ x² + 3x - a = 3

By putting the values,

⟹ 2² + 3*2 - 7 = 3

⟹ 4 + 6 - 7 = 3

⟹ 10 - 7 = 3

⟹ 3 = 3

L.H.S = R.H.S

Hence, Verified