Q. Simplify the following expression completely.x2+3x−28x2+15x+56Answer:
Factor Numerator: Factor the numerator x2+15x+56. To factor the quadratic expression, we need to find two numbers that multiply to 56 and add up to 15. These numbers are 7 and 8. So, x2+15x+56 can be factored as (x+7)(x+8).
Factor Denominator: Factor the denominator x2+3x−28. Similarly, we need to find two numbers that multiply to −28 and add up to 3. These numbers are 7 and −4. So, x2+3x−28 can be factored as (x+7)(x−4).
Simplify Expression: Simplify the expression by canceling out the common factors.The factored form of the expression is (x+7)(x−4)(x+7)(x+8).We can cancel out the common factor (x+7) from the numerator and the denominator.The simplified expression is x−4x+8.