If $a^2 +b^2 +49c^2 + 18 = 2(b - 28c - a)$, then the value of (a - b - 7c) is :
Answer & explanation
Correct answer: option 3
If $a^2 +b^2 +49c^2 + 18 = 2(b - 28c - a)$
then the value of (a - b - 7c) = ?
we can find the values of the variables by =
Coefficient of variables on right sides divide by coefficient of same variable on left side along with the signs as given below =
b = 1
a = -1
c = -\(\frac{28}{49}\) = -\(\frac{4}{7}\)
(a - b - 7c) = (-1 - 1 - 7(-\(\frac{4}{7}\))) = 2