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(x^(2)+6x-30)/(30-6x-x^(2))
Which expression is equivalent to the given expression for all 
x^(2)+6x-30!=0 ?
Choose 1 answer:
(A) -1
(B) 1
(C) 0
(D) 
((x+6)(x-5))/((6-x)(5+x))

x2+6x30306xx2 \frac{x^{2}+6 x-30}{30-6 x-x^{2}} \newlineWhich expression is equivalent to the given expression for all x2+6x300 x^{2}+6 x-30 \neq 0 ?\newlineChoose 11 answer:\newline(A) 1-1\newline(B) 11\newline(C) 00\newline(D) (x+6)(x5)(6x)(5+x) \frac{(x+6)(x-5)}{(6-x)(5+x)}

Full solution

Q. x2+6x30306xx2 \frac{x^{2}+6 x-30}{30-6 x-x^{2}} \newlineWhich expression is equivalent to the given expression for all x2+6x300 x^{2}+6 x-30 \neq 0 ?\newlineChoose 11 answer:\newline(A) 1-1\newline(B) 11\newline(C) 00\newline(D) (x+6)(x5)(6x)(5+x) \frac{(x+6)(x-5)}{(6-x)(5+x)}
  1. Factor Numerator: Factor the numerator x2+6x30x^2 + 6x - 30. To factor the quadratic expression, we look for two numbers that multiply to 30-30 and add to 66. These numbers are 1010 and 5-5. So, x2+6x30x^2 + 6x - 30 can be factored as (x+10)(x5)(x + 10)(x - 5).
  2. Factor Denominator: Factor the denominator 306xx230 - 6x - x^2. Notice that this is a quadratic expression that can be rewritten in standard form as x26x+30-x^2 - 6x + 30. To factor this expression, we look for two numbers that multiply to 3030 and add to 6-6. These numbers are 10-10 and 55. However, since the quadratic has a negative leading coefficient, we can factor out a negative sign to make it easier to see the factors: (x2+6x30)-(x^2 + 6x - 30). Now, we can factor the expression inside the parentheses as (x+10)(x5)-(x + 10)(x - 5).
  3. Write Expression: Write the original expression with the factored numerator and denominator.\newlineThe original expression (x2+6x30)/(306xx2)(x^2 + 6x - 30)/(30 - 6x - x^2) can now be written as ((x+10)(x5))/((x+10)(x5))((x + 10)(x - 5))/(-(x + 10)(x - 5)).
  4. Simplify Expression: Simplify the expression by canceling out common factors.\newlineWe can cancel out the common factors (x+10)(x5)(x + 10)(x - 5) in the numerator and the denominator, but we must also remember the negative sign in the denominator.\newlineAfter canceling, we are left with 1-1, since the negative sign does not cancel out.

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