I think this MIGHT be right I’m not sure but yeah
7.1+m
Or if you needed to add a variable to be the answer it would be 7.1+m=x
Answer:
30-5×2 of 3+(19-3) ÷8
Step-by-step explanation:
30-5×6+(19-3)÷8
30-5×6+16÷8
30-30+8
38-30
8
B
First you have to change 2 1/2 into 5/2
To multiply fractions use the method
Keep Change Flip
5/2 x 3/1 =15/2
Which simplifies to 7 1/2
1. Perfect square trinomials, are 2nd degree polynomials, of the form
![a x^{2} +bx+c](https://tex.z-dn.net/?f=a%20x%5E%7B2%7D%20%2Bbx%2Bc)
so that
![a \neq 0, b \neq 0, c \neq 0](https://tex.z-dn.net/?f=a%20%5Cneq%200%2C%20b%20%5Cneq%200%2C%20c%20%5Cneq%200)
, which can be written as perfect squares.
2. For example
![(x+1) ^{2} = x^{2} +2x+1 (3x-1)^{2}= (3x)^{2}-2(3x)+(-1) ^{2}= 9x^{2}-6x+1 ](https://tex.z-dn.net/?f=%28x%2B1%29%20%5E%7B2%7D%20%3D%20x%5E%7B2%7D%20%2B2x%2B1%0A%20%0A%283x-1%29%5E%7B2%7D%3D%20%283x%29%5E%7B2%7D-2%283x%29%2B%28-1%29%20%5E%7B2%7D%3D%209x%5E%7B2%7D-6x%2B1%20%20%20%20%0A)
3. Thus
![x^{2} +2x+1, 9x^{2}-6x+1](https://tex.z-dn.net/?f=x%5E%7B2%7D%20%2B2x%2B1%2C%209x%5E%7B2%7D-6x%2B1%20)
are perfect square trinomials.
4.
![x^{2} -bx+100= x^{2} -bx+ 10^{2}= (x+10)^{2} or (x-10)^{2}](https://tex.z-dn.net/?f=%20x%5E%7B2%7D%20-bx%2B100%3D%20x%5E%7B2%7D%20-bx%2B%2010%5E%7B2%7D%3D%20%28x%2B10%29%5E%7B2%7D%20%20%20or%20%20%28x-10%29%5E%7B2%7D)
5. In the first case -b=20, so b=-20. In the second case, -b=-20, so b=20.
6. b∈{-20, 20}