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TaraC
26.08.2019 •
Mathematics
Given the equation 4x2 − 8x + 20 = 0, what are the values of h and k when the equation is written in vertex form a(x − h)2 + k = 0?
h = 4, k = −16
h = 4, k = −1
h = 1, k = −24
h = 1, k = 16
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Ответ:
The correct option is:
h = 1, k = 16
Step-by-step explanation:
y=4x^2-8x+20 =0
It is a quadratic formula in standard form:
ax^2+bx+c
where a = 4 , b = -8 and c=20
The vertex form is:
a(x − h)2 + k = 0
h is the axis of symmetry and (h,k) is the vertex.
Calculate h according to the following formula:
h = -b/2a
h= -(-8)/2(4)
h = 8/8
h = 1
Substitute k for y and insert the value of h for x in the standard form:
ax^2+bx+c
k = 4(1)^2+(-8)(1)+20
k = 4-8+20
k=-4+20
k = 16
Thus the correct option is h=1, k=16
Ответ:
The slope of the perpendicular line m =6
Step-by-step explanation:
Step(i):-
Given that the equation of the straight line
2x + 12y =-192
⇒ 12 y = -192 -2x
y = m x +C
The slope of the given line![m = \frac{-1}{6}](/tpl/images/1072/7076/e92a4.png)
Step(ii):-
The slope of the perpendicular line
=![\frac{-1}{\frac{-1}{6} }](/tpl/images/1072/7076/a49bf.png)
The slope of the perpendicular line m =6