16x² - 49
= (4x)² - 7²
Identity =》 a² - b² = (a + b) (a - b)
(4x)² - 7²
= (4x + 7) (4x - 7) [3rd option]
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Answer:
y=x-13
Step-by-step explanation:
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Answer:
positive
Step-by-step explanation:
a negative times a negative is always a positive
Answer: 
Step-by-step explanation:
Given
The diameter of a circle is 
So, the radius is 
The circumference is given by 
Insert the values

Thus, the circumference of the circle is
Answer: B
15cm and 9cm
Step-by-step explanation: