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Factoring a quadratic

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#7 Factor 9x^2 + 5x - 4

#8 How is solving a quadratic equation like 6x^2 - x = 15 different from solving a linear equation like 2x + 3 = 7?
Solve 6x^2 - x = 15.

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Solution Summary

The solution shows how to factor a simple quadratic.

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Hello and thank you for posting your question to Brainmass.

To factor 9x^2 + 5x - 4 we note that 5 = 9 - 4

Hence:

9x^2 + 5x - 4 = 9x^2 + 9x - 4x - 4 = 9x(x+1) - 4(x+1) = (9x-4)(x+1)

9x^2 + 5x - 4 = (9x-4)(x+1)

In quadratic ...

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