Answer:
No, he is not correct because the constant in his answer should have been 21 not 7.
Step-by-step explanation:
![3(x+2a+7)=3x+6a+21](https://tex.z-dn.net/?f=3%28x%2B2a%2B7%29%3D3x%2B6a%2B21)
Therefore, the correct answer is the fourth; he should have put 21.
Try to make each one to only have one decimal place... the first one is 4.5*10^-6
Answer:
x = (1 ±√97)/4 ≈ {-2.21221, 2.71221}
Step-by-step explanation:
Multiply the equation by 12x to clear fractions.
12 = 2x^2 -x
6 = x^2 -1/2x . . . . . . divide by 2
6 +1/16 = x^2 -1/2x +1/16 = (x -1/4)^2 . . . . . add 1/16 to complete the square
±√(97/16) +1/4 = x . . . . . . square root and add 1/4
x = (1 ±√97)/4
x ≈ -2.21221, 2.71221
I'll give you a pdf so you can see it yourself and the correct answer is -32b - 32b