Answer:
4x - 7
Step-by-step explanation:
We can simplify this expression by subtracting the binomial (a bracket with two terms) and collecting like terms (numbers with the same variable).
When subtracting a binomial, are actually multiplying each term in the binomial by negative one.
7x -(7 + 3x)
= 7x -1(7 + 3x) Distribute -1 to each of the numbers
= 7x + (7*(-1) + 3x*(-1)) Multiply
= 7x + (-7 - 3x) Get rid of the brackets.
= 7x - 7 - 3x Combine like terms
= 4x - 7 Simplified expression
Given:
edge 1 = 3x - 4
edge 2 = x² - 1
edge 3 = 2x² - 15
perimeter if x = 4
edge 1 = 3(4) - 4 = 12 - 4 = 8
edge 2 = 4² - 1 = 16 - 1 = 15
edge 3 = 2(4²) - 15 = 2(16) - 15 = 32 - 15 = 17
Perimeter = 8 + 15 + 17 = 40 feet.
Answer:
93°
Step-by-step explanation:
It's given that angle AOC is 87°. BC is a straight line so, angle E=180°-87°=93°
Answer:
2
Step-by-step explanation:
16x-6=26
16x=32
x=2
Answer:
16
Step-by-step explanation:
x² + 8x = 4 ⇔ x² + 8x + 16 = 4 + 16 ⇔ x² + 2×4x + 4² = 20 ⇔ (x + 4)² = (2√5)²
Remark : (2√5)² = 20
