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If x2 - 7x = -12, What is the vale of x?
1. -3 or -4
2. 3 or 4
3. 3 or -4
4. Cannot be determined

1 Answer

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Best answer
Correct Answer - Option 2 : 3 or 4

Given:

If x2 – 7x = -12, then find the value of x?

Calculation:

⇒ x2 – 7x + 12 = 0

⇒ x2 – 3x – 4x + 12 = 0

⇒ x( x – 3 ) – 4( x – 3 ) = 0

⇒ ( x – 3 )( x – 4 ) = 0

x = 3,4

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