Determine the x-intercept(s) of the quadratic function. f(x)=x^2-x-56?
回答 (2)
2015-12-07 1:08 am
The x-intercepts are the values of x for which f(x) = 0. You need to solve x² - x - 56 = 0
x² - x - 56 = (x-8)(x+7) = 0
x-intercepts: 8,-7
f(x) crosses the x-axis at (8,0) and (-7,0)
x² - x - 56 = (x-8)(x+7) = 0
x-intercepts: 8,-7
f(x) crosses the x-axis at (8,0) and (-7,0)
2015-12-07 1:13 am
x^2-x-56
factor
(x-8)(x+7) = x^2-x-56
x-8=0
x=8
x+7=0
x=-7
factor
(x-8)(x+7) = x^2-x-56
x-8=0
x=8
x+7=0
x=-7
收錄日期: 2021-04-21 15:36:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20151206170428AAAYFic