Question

What method would you choose to solve the

equation 2x4 – 7 = 9? Explain why you chose this
method.

Answer 1

Explanation:

I would use the square root property of equality. Because there is no x term, I would just add and divide to get x2 by itself. Then I would take the square root.

Answer 2

his is a quadratic equation . We order to equate to zero

2x² – 7 = 9

2x² - 7-9 = 0

2x² - 16 = 0

This equation is a binomial

2* (x² - 8) = 0

We choose the simplest method . The equation with practice it can be calculated in the memory

The product is equal to 0 if one of the factors is zero

2≠0 ∨ x² - 8 = 0

x² = √8

x = √8 ∨ x= - √8

Answer : x = √8 ∨ x = -√8