Quadratic in Form Polynomials

Question 1

What substitution should be used to rewrite 4x4 – 21x2 + 20 = 0 as a quadratic equation?

Revolt · Accepted Answer

u = x2

Question 2

What are the solutions of the equation x4 + 95x2 – 500 = 0? Use factoring to solve.

Revolt · Accepted Answer

and x = ±10i

Question 3

What are the solutions of the quadratic equation (x – 8)2 – 13(x – 8) + 30 = 0? Use u substitution to solve.

Revolt · Accepted Answer

x = 11 and x = 18

Question 4

Which quadratic equation is equivalent to (x2 – 1)2 – 11(x2 – 1) + 24 = 0?

Revolt · Accepted Answer

u2 – 11u + 24 = 0 where u = (x2 – 1)

Question 5

Which quadratic equation is equivalent to (x + 2)2 + 5(x + 2) – 6 = 0?

Revolt · Accepted Answer

u2 + 5u – 6 = 0 where u = (x + 2)

Question 6

Which equation is quadratic in form?

Revolt · Accepted Answer

7x6 + 36x3 + 5 = 0

Question 7

What substitution should be used to rewrite 4x12 – 5x6 – 14 = 0 as a quadratic equation?

Revolt · Accepted Answer

u = x6

Question 8

What are the solutions of the equation x4 + 6x2 + 5 = 0? Use u substitution to solve.

Revolt · Accepted Answer

i and x = i

Question 9

What is the solution of the equation (x – 5)2 + 3(x – 5) + 9 = 0? Use u substitution and the quadratic formula to solve.

Revolt · Accepted Answer

x = StartFraction 7 plus-or-minus 3 i StartRoot 3 EndRoot Over 2 EndFraction

Question 10

What substitution should be used to rewrite 6(x + 5)2 + 5(x + 5) – 4 = 0 as a quadratic equation?

Revolt · Accepted Answer

u = (x + 5)

Quadratic in Form Polynomials Answers