Question

11. (y-3) = y2 -9

12. (z + 5)2 = z2 + 25
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Answer 1

Answer:

$(11) \: \: y - 3 = {y}^{2} - 9 \\ \\ = > {y}^{2} - 9 + 3 - y = 0 \\ \\ = > {y}^{2} - y - 6 = 0 \\ \\ = > {y}^{2} - 3y + 2y - 6 = 0 \\ \\ = > y(y - 3) + 2(y - 3) = 0 \\ \\ = > (y + 2)(y - 3) = 0 \\ \\ = > y = 3 \: ,\: y = - 2 \\ \\ (12) \: {(z + 5)}^{2} = {z}^{2} + 25 \\ \\ = > {z}^{2} + 25 + 10z = {z}^{2} + 25 \\ \\ = > z = 0$

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Answer 2

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