Answer:
x = 5
Step-by-step explanation:
<u>Step 1: Multiply out the brackets</u>
48x - 80 - 40x + 80 = 40 → <em>negative + negative = positive [-10 x -8]</em>
<u>Step 2: Simplify</u>
8x = 40 →<em> collect like terms</em>
<u>Step 3: Solve</u>
x = ![\frac{40}{8}](https://tex.z-dn.net/?f=%5Cfrac%7B40%7D%7B8%7D)
x = 5
Hello,
cos 2t=2cos²t-1
2cos 2t -cos t-1=
==>2(2cos² t -1)-cos t-1=0
==>4cos² t -cos t -3=0
Δ=(1+4*4*3=49=7²
cos t= (1+7)/8 or cos t=(1-7)/8
cos t =1 or cos t=-3/4
t=0° or t=138.590377...°
Answer with explanation:
⇒The Meaning of Additive Identity is that element in a set when added to any member or elements of set yields that element.
Consider a system of forces under a set F , which is a vector space under a field .
The set F having three forces a, b, c will be a vector space if,
1.→ a +(b+c)=(a+b)+c
2.→ a+b=b+a
3.→There must exist a force equal to 0, such that when any of the forces added to 0 the resultant is force itself.
That is , a+0=a=0+a
→→So,If you consider any vector space over a field ,there exist an element in that set equal to 0, when added to any member of the elements of the set the result being that element.So, element 0 is the Additive Identity of any vector space.