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Answer:
14x + 7 = 30
Step-by-step explanation:
Given
7y + 6 = 36 and y = 2x + 1
substitute y = 2x + 1 into 7y + 6 = 36 , that is
7(2x + 1) + 6 = 36 ( subtract 6 from both sides )
7(2x + 1) = 30 ← distribute parenthesis on left side by 7
14x + 7 = 30
Answer:
- 10
- 15ab
Step-by-step explanation:
1. The square of the binomial is ...
(* -2m)^2 = *^2 -4m* +4m^2
Matching terms, you find ...
*^2 = 100
-4m* = -40
Both of these equations tell you the value of * is 10.
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2. Same deal. Multiply ou the square and see what you have.
(3a +2.5b)^2 = 9a^2 +15ab +6.25b^2
The term missing on the right side of the given equation is 15ab.
The goal is to put the equation in the simplest form to solve:
2x²+17=179
Subtract both sides by 17.
179-17= 162
2x²=162
Square root 162.
√162 = 12.7 (rounded)
2x=12.7
Divide both sides by 2.
12.7/2= 6.4 (rounded)
x=6.4
The variable x is 6.4, rounded to the nearest tenth for simple purposes.
Hope this was helpful.
