The factored form of given equation y = x^2 + 4x - 21 is (x + 7)(x – 3)
<u>Solution:</u>
Given, equation is 
We have to factor the above equation
Now, take the expression 

"4x" can be splitted as (7 - 3)x

"21" can rewritten as 

Taking "x" as common from first two terms and "3" as common from next two terms

Taking "x + 7" as common term,

Hence, the factored form of given equation is y = ( x + 7 )( x – 3 )
Answer:
Without an opposite, the only operation that can be used is C a/h or Cos Adjacent/ Hypotenuse
<span> You can find the circumference of a circle just by multiplying the diameter by pi. Plugging π into your calculator will give you its numerical value, which is a closer approximation of 3.14 or 22/7. Plug the given value of the diameter into the formula and solve.</span>