Factorise -x^2-20x-100

(x+10)(x+10) or (x+10)^2

Step-by-step explanation:

Divide by -1 first

a=1

b=20

c=100

Since a*c whose sum is b...

1*100=100

10*10=100 and adds to 20

The answer is (x+10)(x+10) or (x+10)^2

so a parallelogram is just like a square base times height. multiply 40 and 39 to get 1560 inches.

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