width= 7m
Step-by-step explanation:
Area= L×W
L= (x+8)m
W=8m
105m²= (x+8)m × (x)m
105m²= x² + 8x
-x² - 8x + 105= 0
(x-7) (x+15) = 0
x= 7 x= -15
x=width = 7m
A math expression is anything where you take one or more numbers and add them, subtract them, multiply, divide, etc etc
For example, 2+3 is a math expression
To make it an algebraic expression, we replace one of the numbers with a variable. Often this is the letter x. So let's say we replace the 2 with x. That would have the expression turn into x+3. What we're saying is "some number plus 3"
Normally 2+3 = 5 which is a true equation. Replace the 2 with x and we have x+3 = 5. So we're saying "some number plus 3 is 5". You can guess and check to find that the "some number" has to be 2
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In summary, the expression example was x+3 and the equation was x+3 = 5
Note: an equation is simply two expressions set equal to each other.
2.4/3. 3 goes into 2 0 times. 0 *3 is 0. 2-0 is 2. Bring down the four. 3 goes into 24 8 times. Bring the decimal directly above where it is above the bar. The answer is 0.8. (Sorry there are no pics).
Answer:
(1,3) and (4,6)
Step-by-step explanation:
<u>----Solve by substitution---</u>
Add 4x to both sides
Subtract 2 from both sides
Subtract 5x from both sides
x^2-5x+4 = 0
Factor , = (x-4)(x-1)
First variable : x = 1 and x = 4
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<u>Substitute</u> 1 for x in the 2nd equation
y=(1)+2 = 3
First answer is (1,3)
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<u>Substitute</u> 4 for x in the 1st equation
4^2-4(4)+6 = 6
Second answer: (4,6)