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3 years ago

15

Break a part the addends to find the sum 18+21

2 answers:

Mrac [35]3 years ago

4 0

18------10+8
20------20+1

10+8+20+1=39

Hope that helped:)

Pavel [41]3 years ago

3 0

- - Solve:
18 - - 10+8
21 - - 10+11

10+8+10+11=39

=18+21=39<span />

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We have $f(0,0,-6)=60$ , $f(0,0,6)=-60$ , $f(0,-\sqrt{11},-5)=61$ , and $f(0,\sqrt{11},-5)=61$ . So $f$ has a maximum value of 61 and a minimum value of -60.

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