704.98−2.056=□

68,442

702.924

684.42

68.442

702.924

Step-by-step explanation:

Key skills needed for this are: Decimal subtraction, lining up decimal points

1) We have this problem --> 704.98-2.056

2) Rewrite it like this --> 704.980 (put a placeholder 0 since it helps

                                   -       2. 056

                                  You have to regroup once in the problem, (0 - 6 becomes 10 - 6 and 8-5 becomes 7 -5) . And it will make the last 2 digits of the answer 24

3) The rest of the problem is regular subtraction --> and your answer will be 702.924

1,918

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15