The most common way to represent the absolute value of a number or expression is to surround it with the absolute value symbol: two vertical straight lines.
|6| = 6 means “the absolute value of 6 is 6.”
|–6| = 6 means “the absolute value of –6 is 6.”
|–2 – x| means “the absolute value of the expression –2 minus x.”
Answer:
2.1
Step-by-step explanation:
Answer:
f(3) = 30
Step-by-step explanation:
f(3) = 2(3)^2 + 12 = 30
Your goal is to have x by itself
Send st to other side
rx= r+st
Divide by r so x stays alone
X=(r+st)/r
Which is also equal to
X=r/r+st/r
X= 1+st/r
Answer:
4 d
Step-by-step explanation:
Given D is mid-point of BC and AD⊥AC
From right angle △DAC
cosC=
a/2
b
=
a
2b
...(i)
also from cosine formulae
cosC=
2ab
a
2
+b
2
−c
2
...(ii)
From (i) and (ii) we get
a
2b
=
2ab
a
2
+b
2
−c
2
⇒4b
2
=a
2
+b
2
−c
2
⇒b
2
=
3
a
2
−c
2
∴cosAcosC=
2bc
b
2
+c
2
−a
2
.
a
2b
=
ca
[(
3
a
2
−c
2
)+c
2
−a
2
]
=
3
2
(
ca
c
2
−a
2
)