OMTEX CLASSES: 7x2 + 4x

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(xv) 7x²+ 4x – 20 = 0

Sol. 7x²+ 4x – 20 = 0

∴ 7x² + 14x – 10x – 20 = 0

∴ 7x (x + 2) – 10 (x + 2) = 0

∴ (x + 2) (7x – 10) = 0

∴ x + 2 = 0 or 7x – 10 = 0

∴ x = – 2 or 7x = 10

∴ x = – 2 or x = ¹⁰/₇