25m^2-16=0 please show work as well?
回答 (8)
2009-01-14 7:15 am
✔ 最佳答案
You have a difference of squares:(5m)² - 4² = 0
Factor using this rule --> a² - b² = (a - b)(a + b)
(5m - 4)(5m + 4) = 0
Answer:
m = 4/5
or
m = -4/5
2009-01-14 11:34 am
a^2 - b^2 = (a + b)(a - b)
25m^2 - 16 = 0
(5m)^2 - 4^2 = 0
(5m + 4)(5m - 4) = 0
5m + 4 = 0
5m = -4
m = -4/5 (-0.8)
5m - 4 = 0
5m = 4
m = 4/5 (0.8)
ⴠm = ±4/5 (±0.8)
25m^2 - 16 = 0
(5m)^2 - 4^2 = 0
(5m + 4)(5m - 4) = 0
5m + 4 = 0
5m = -4
m = -4/5 (-0.8)
5m - 4 = 0
5m = 4
m = 4/5 (0.8)
ⴠm = ±4/5 (±0.8)
2009-01-14 7:20 am
25m^2=16
take sqrt of both sides
5m=4
m=4/5 and -4/5
take sqrt of both sides
5m=4
m=4/5 and -4/5
2009-01-14 7:16 am
This is the difference of two squares. That is,
25m^2 - 16 =
(5m)^2 - (4)^2 =
(5m + 4)(5m - 4) = 0
That is, either factor (5m + 4) = 0, or (5m - 4) = 0.
So, 5m = -4, or 5m = 4. Therefore,
m = -4/5, or m = 4/5
25m^2 - 16 =
(5m)^2 - (4)^2 =
(5m + 4)(5m - 4) = 0
That is, either factor (5m + 4) = 0, or (5m - 4) = 0.
So, 5m = -4, or 5m = 4. Therefore,
m = -4/5, or m = 4/5
2009-01-14 7:16 am
25m^2=16
25m=Square root 16..4
m=4/25
25m=Square root 16..4
m=4/25
2009-01-14 7:15 am
25m^2 -16 = 0
25 m^2 = 16
m^2 = 16/25
m = 4/5 or m = -4/5
25 m^2 = 16
m^2 = 16/25
m = 4/5 or m = -4/5
2009-01-14 7:15 am
25 m^2 -16 = 0
25 m^2 = 16
m ^2 = 16/25
m = sqrt ( 16/25) = 4 /5
25 m^2 = 16
m ^2 = 16/25
m = sqrt ( 16/25) = 4 /5
2009-01-14 7:15 am
you rewrite as
25m^2=16 or m^2=16/25
you take the root
2 solutions m=-4/5 m=4/5
25m^2=16 or m^2=16/25
you take the root
2 solutions m=-4/5 m=4/5
收錄日期: 2021-05-01 11:49:59
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