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ICSE / ISC eBooks

Exercise - 7 A

Solve the following quadratic equations :

Q. 1. 15x² - 28 = x

Q. 2. x(2x + 5) = 25

Q. 3. x(2x + 5) = 3

Q. 4. 3x² - 5x - 12 = 0

Q. 5. 4x² - 3x - 1 = 0

Q. 6. 21x² - 8x - 4 = 0

Q. 7. x(6x - 1) = 35

Q. 8. 3x² = x + 4

Q. 9. x(2x + 1) = 6

Q. 10. (x + 3) (x - 3) = 40

Q. 11. a² - 3a - 54 = 0

Q. 12. 48x² - 13x - 1 = 0

Q. 13. abx² + (b² - ac) x - bc = 0

Q. 14.

Q. 15.

Q. 16.

Q. 17.

Q. 18.

Q. 19.