(a+b)²-4ab=please help me for my exam
1 answer:
Answer:
Step-by-step explanation:
<h3>to understand this</h3><h3>you need to know about:</h3>- algebra
- algebraic identity:(a-b)²=(a+b)²-4ab
therefore
using the identity our answer is (a-b)²
let's prove it
- (a-b)²:a²-2ab+b²
- rewrite -2ab as 2ab-4ab:a²+b²+2ab-4ab
- use (a+b)²=a²+2ab+c²:(a+b)²-4ab
therefore
we have also proven that
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The length of ladder is 30 ft.
<h3>How can the feet that made up the side of the building is the top of the ladder be known ?</h3>The formula below can be used in solving the problem
Tan (∅)=
∅=70°
opposite = BC
Adjacent = 12 ft
70°= opposite/ 12
opposite= 32.96 ft
Therefore, The length of ladder is 30 ft.
NOTE; Since the actual diagram can not be found i solved another on on the same topic
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CHECK COMPLETE QUESTION BELOW:
Consider the diagram shown where a ladder is leaning against the side of a building. the base of the ladder is 12ft from the building. how long is the ladder? (to the nearest ft)
a. 25ft
b. 30ft
c. 35ft
d. 40ft
