PROBLEM 5. Find if y = .
Answer: = =
PROBLEM 6. Find if y = .
Answer: = =
PROBLEM 7. Find if y = .
Answer: = =
PROBLEM 8. Find if y = (x^4 + x)^2.
Answer: = 2(x^4 + x)(4x^3 + 1)
PROBLEM 9. Find if y = .
Answer: = =
PROBLEM 10. Find at x = 1 if y = [(x^3 + x)(x^4 − x^2 )]^2.
Answer: = 2 [(x^3 + x)(x^4 − x^2 )][(x^3 + x)(4x^3 − 2x)(x^4 − x^2 )(3x^2 + 1)]
Once again, plug in right away. Never simplify until after you’ve substituted.
At x = 1, = 0.