Using factorization, find the roots of the quadratic equation: 2z ²+az-a ²=0.

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Using factorization, find the roots of the quadratic equation: 9y ²-3y-2= 0.
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Using factorization, find the roots of the quadratic equation: 5z ²-3z-2= 0.
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Using factorization, find the roots of the quadratic equation: 8x ²-22x-21= 0. 44

Using factorization, find the roots of the quadratic equation: 5x ² - + =0.