Answer:
(x+1)² = 14
a = 1, b = 14
Step-by-step explanation:
Given the equation, x² + 2x = 13
We are to use the completing the square method to express in the form
(x + a)² = b
x² + 2x = 13
Add the square of half of the coefficient of x to both sides
Coefficient of x = 2
Half of the coefficient of x = 2/2
Square of the result = (2/2)²
Square of the result = 1²
Add (1/2)² to both sides
x² + 2x + (1)² = 13 + (1)²
(x+1)² = 13 + 1
(x+1)² = 14
Compare with (x+a)² = b
a = 1 and b = 14
Filling in one equation into the other will lead to elimination of one variable, enabling you to solve the other. In this case it is very easy to eliminate variable e right away. So you end up equating the terms of A and B:
4f + 1 = e = 3f+ 5
Forget e and you see it is answer D.
Answer:
3,2
Step-by-step explanation:
Answer:
in one year the tofu will cost $3,16
In five years the tofu will cost $3,88