I need a long complicated math problem that equals 15. I give my cousin a gift card but I don’t want to tell her what the value is, I want her to find out.

**Answer 1**

x^2-10x+y^2-20y=-125 what is x+y=?

(The solution)

First complete the square

This is done by taking the term x and y (numbers in front of x and y not x^2 y^2) dividing it by 2 and squaring it and adding it on the other side to get

x^2-10x+25+y^2-20y+100=0

now break it

x^2-10x+25=0 and y^2-20y+100=0

trinomial factor this (draw an x put the last number at the top and the middle number at the bottom of each equation) now you want two numbers to put on the side of the x they will be the same number and need to multiply to equal the top number and added to be the bottom number, so for x I used -5 (-5^2 = 25 and -5 + -5 = -10) and for y I used -10 (-10^2 = 100 and – 10 + -10 = -20) so these now work to write it outside of your simply (x-5)^2 + (y-10)^2 = 0 so now just take the opposite of the number in the ( ) for the answers so x= 5 and y=10 because (5-5)^2+(10-10)^2=0 and to check you can plug into the original equation to find that when x=5 and y=10 will equal -125 like the original equations so now say x+y=5+10 which is equal to 15 the number you wanted hope it is long enough and I explained my process pretty well

Source(s): invented

**answer 2**

complicated mathematical equation

**answer 3**

4 times 5 -9+4

**answer 4**

3 times 5 – 2 +6-4

**Answer 5**

Take the square root of 100 and multiply it by 5. Then add 30, minus 5, then divide by 5.

**Answer 6**

48/3-12+8*2-10/2-5*3+8-7+8

(if you’re using a calculator, put it in parts, otherwise you’ll get 9)

Source(s): me

**Answer 7**

square(([(3*4*5*6)-310]/2))+((5!)/12) = 15 ha ha

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