Factor -z^2+20z+21

Factor -1 out of -z2+20z+21.
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Factor -1 out of -z2.
Factor -1 out of 20z.
Rewrite 21 as -1(-21).
Factor -1 out of -(z2)-(-20z).
Factor -1 out of -(z2-20z)-1(-21).
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Factor z2-20z-21 using the AC method.
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Consider the form x2+bx+c. Find a pair of integers whose product is c and whose sum is b. In this case, whose product is -21 and whose sum is -20.
Write the factored form using these integers.
Remove unnecessary parentheses.
Factor -z^2+20z+21

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