please work!
2007-08-11 02:51:39 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
19
10^2- 9^2 = 10^2-(10-1)^2 = 10^2- (10^2-2(10)+1^2 )= 20 -1 = 19 As the 10^2's cancel out and you are left with 2(10)-1
using (a-1)^2 = a^2-2a+1
2007-08-11 02:58:14 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Difference between 10 squared and 9 squared is 19. Below is the solution:
= (10)(10) - (9)(9)
= 100 - 81
= 19
2007-08-11 10:03:17 · answer #2 · answered by cehLina 2 · 0⤊ 1⤋
Difference between 10squared and 9 squared is 19.
10*10= 100
9*9 = 81
there fore 100-81 =19
2007-08-11 11:11:23 · answer #3 · answered by varsha.j. l 2 · 0⤊ 1⤋
10^2-9^2=x
Multiply 10 by 10 and get 100
10*10=100 then write down the rest of the math problem
100-9^2=x
Multiply 9 by 9 and get 81
Write down the following problem
subtract 81 from 100 and get the differnence between 10 squared and 9 squared.
100-81=x
x=19
2007-08-11 11:20:29 · answer #4 · answered by firefighter 3 · 0⤊ 1⤋
10²-9² = (10+9)(10-9) = 19*1 = 19.
The difference of 2 squares is their sum times
their difference.
2007-08-11 10:21:18 · answer #5 · answered by steiner1745 7 · 0⤊ 1⤋
19
2007-08-11 10:00:09 · answer #6 · answered by Pushpa Padmanabhan 5 · 0⤊ 1⤋
(10^2-9^2)=(10+9)(10-9)=19*1=19. That using the formula (a^2-b^2)=(a+b)(a-b)
2007-08-11 09:59:22 · answer #7 · answered by nandiana2003 1 · 0⤊ 1⤋
10*10=100
9*9=81
100 - 81=19
2007-08-11 10:27:26 · answer #8 · answered by Burak 3 · 0⤊ 1⤋
100-81=19
2007-08-11 10:04:57 · answer #9 · answered by verner66 2 · 0⤊ 1⤋
10^2= 10x10= 100
9^2= 9x9= 81
Ya dig?
So yeah... 19
2007-08-11 09:58:06 · answer #10 · answered by Anonymous · 0⤊ 1⤋