Answer:
Step-by-step explanation:
Given expression:
Let u = (x - y):
To factor a quadratic in the form find two numbers that multiply to and sum to :
Therefore, the numbers are: -6 and -4.
Rewrite as the sum of these two numbers:
Factor the first two terms and the last two terms separately:
Factor out the common term (u - 2):
Substitute back in u = (x - y):
Simplify:
Answer: Tim weighs 90 lbs and his brother weighs 130 lbs
Direct substitution: replace all the x with 2:
f(2)=3*
-2*2³+2²-3*2+4=34