Solve by completing the square

x^2-7x-30=0

1. x=10 2.x=-3

Step-by-step explanation: hope this helps

There are two solutions

x = 10

x = -3

Step-by-step explanation:

Step-1 : Multiply the coefficient of the first term by the constant   1 • -30 = -30

Step-2 : Find two factors of  -30  whose sum equals the coefficient of the middle term, which is   -7 .

     -30    +    1    =    -29

     -15    +    2    =    -13

     -10    +    3    =    -7  

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -10  and  3

                    x2 - 10x + 3x - 30

Step-4 : Add up the first 2 terms, pulling out like factors :

                   x • (x-10)

             Add up the last 2 terms, pulling out common factors :

                   3 • (x-10)

Step-5 : Add up the four terms of step 4 :

                   (x+3)  •  (x-10)

            Which is the desired factorization

Step-6 : Switch the signs inside the parenthesis.

I hope I helped.

answer: 34rtyj,jkhtyetwrhyjeuiejnbhdfknbkguxfrbhkfdbjvkmbd,kvbsd.kxjvbhjnfbgjxdfn

step-by-step explanation:

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.