Question

Set up an equation and solve the problem. Two times the square of a number equals 128

Answer 1

The square of a number is just putting it to an exponent of 2.

2 times the square of a number would be:

2x^2

Set that equal to 128.

2x^2 = 128

Divide by 2

x^2 = 64

Square root both sides

x = 8

Answer 2

: word problem equation- solve for fourteen articles are bought . some cost $2. each and the remainder cost $2.50 each .if the total amount spent is $30 how many of each article are bought