Factorise,z²-8z+15please answer this question.

1.	Factorise,z²-8z+15please answer this question.
Answer» align="ABSMIDDLE" alt="\huge\star{\underline {\mathtt{\RED{A}\pink{N}\green{S}\blue{W}\purple{E}\orange{R}\star}}}" class="latex-formula" id="TexFormula1" SRC="https://tex.z-dn.net/?f=%5Chuge%5Cstar%7B%5Cunderline%20%7B%5Cmathtt%7B%5Cred%7BA%7D%5Cpink%7BN%7D%5Cgreen%7BS%7D%5Cblue%7BW%7D%5Cpurple%7BE%7D%5Corange%7BR%7D%5Cstar%7D%7D%7D" title="\huge\star{\underline {\mathtt{\red{A}\pink{N}\green{S}\blue{W}\purple{E}\orange{R}\star}}}"> $= > {z}^{2} - 8z + 15 = 0$ $= > {z}^{2} - 5z - 3z + 15 = 0$ $= > z(z - 5) - 3(z - 5) = 0$ $= > (z - 3)(z - 5) = 1$ $= > z = 3 \: and \: z = 5$

Answer»

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$= > {z}^{2} - 8z + 15 = 0$