math problems?
回答 (3)
2020-08-25 2:04 pm
Method 1: completing square
y² -14y -1 = 0
y² - 14y = 1
y² - 14y + 7² = 1 + 7²
(y - 7)² = 50
y - 7 = ±√50
y = 7 + 5√2, 7 - 5√2
====
Method 2: Using formula y = [b ± √(b² - 4ac)]/(2a)
y² -14y -1 = 0
y = {-(-14) ± √[(-14)² - 4(1)(-1)]}/2
y = (14 ± √200)/2
y = (14 ± 10√2)/2
y = 7 + 5√2, 7 - 5√2
y² -14y -1 = 0
y² - 14y = 1
y² - 14y + 7² = 1 + 7²
(y - 7)² = 50
y - 7 = ±√50
y = 7 + 5√2, 7 - 5√2
====
Method 2: Using formula y = [b ± √(b² - 4ac)]/(2a)
y² -14y -1 = 0
y = {-(-14) ± √[(-14)² - 4(1)(-1)]}/2
y = (14 ± √200)/2
y = (14 ± 10√2)/2
y = 7 + 5√2, 7 - 5√2
2020-08-25 1:11 pm
can any one help y2-14y-1=0
2020-08-25 1:11 pm
Math, Meth, mold problems all of it
收錄日期: 2021-04-24 08:01:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200825050852AAoy18X