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Are these problems right? Factor the trinomial b^3-2b^2-63b my answer b(b+7)(b-9)

Factor, s^2+18s+81, My answer, (s+9)^2 Express using a positive exponent, x^-8, My answer, 1/x^8, A 15-in TV set also has a width of 12 inches. What is its height? My answer 9inches, Jack usually mows his lawn in 7 hrs. Marilyn can mow the same yard in 5hrs. How much time would it take for them to mow the lawn together? My answer 2.92hrs. Add, (4x^2-5xy+y^2)+(-7x^2-8xy-y^2)+(x^2+xy-3y^2), My answer, -2x^2-12xy-3y^2. Simplify by removing factors of 1, 8s^2+8s/40s^2+64s, My answer s+1/5s+8. Find the greatest common factor for the group of terms, -18a^4, 3a^5 My answer, -3a^4. Write a quadratic equation in the variable x having the given numbers as solutions, typing the equation in standard form, ax^+bx+c=0, Solution;8 only solution, MY answer x^2-16x+64=0. Solve, c^2+3c-10=0, MY answer, -5,2. That is all for now!!

Factor, s^2+18s+81, My answer, (s+9)^2 Express using a positive exponent, x^-8, My answer, 1/x^8, A 15-in TV set also has a width of 12 inches. What is its height? My answer 9inches, Jack usually mows his lawn in 7 hrs. Marilyn can mow the same yard in 5hrs. How much time would it take for them to mow the lawn together? My answer 2.92hrs. Add, (4x^2-5xy+y^2)+(-7x^2-8xy-y^2)+(x^2+xy-3y^2), My answer, -2x^2-12xy-3y^2. Simplify by removing factors of 1, 8s^2+8s/40s^2+64s, My answer s+1/5s+8. Find the greatest common factor for the group of terms, -18a^4, 3a^5 My answer, -3a^4. Write a quadratic equation in the variable x having the given numbers as solutions, typing the equation in standard form, ax^+bx+c=0, Solution;8 only solution, MY answer x^2-16x+64=0. Solve, c^2+3c-10=0, MY answer, -5,2. That is all for now!!

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