Quadratic in Form Polynomials

Question 1

What are the solutions of the equation x4 – 9x2 + 8 = 0? Use u substitution to solve.

Revolt · Accepted Answer

x = ±1 and

Question 2

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

Revolt · Accepted Answer

u = x2

Question 3

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

Revolt · Accepted Answer

and x = ±10i

Question 4

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 5

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

Revolt · Accepted Answer

i and x = i

Question 6

Which equation is quadratic in form?

Revolt · Accepted Answer

10x8 + 7x4 + 1 = 0

Question 7

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 8

Which quadratic equation is equivalent to (x – 4)2 – (x – 4) – 6 = 0?

Revolt · Accepted Answer

u2 – u – 6 = 0 where u = (x – 4)

Question 9

What are the solutions of the equation x4 + 3x2 + 2 = 0? Use u substitution to solve.

Revolt · Accepted Answer

and x = ±i

Question 10

What substitution should be used to rewrite 16(x3 + 1)2 – 22(x3 + 1) – 3 = 0 as a quadratic equation?

Revolt · Accepted Answer

u = (x3 + 1)

Quadratic in Form Polynomials Answers