3 years ago

Z – 15 z + 90 z + 15 z – 9

Mathematics

1 answer:

kenny6666 [7]3 years ago

8 0

Answer:

z + 15

Step-by-step explanation:

${z}^{2} + 9z - 90 \\ \\ = {z}^{2} - 6z + 15z - 90 \\ \\ = z(z - 6) + 15(z - 6) \\ \\ = (z - 6)(z + 15) \\$

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