Question

The square root of 5 less than twice a number is 7. Find the number.

Answer 1

Answer:

4.618

Step-by-step explanation:

Let's use x to represent the number so we can write an equation to solve it.

'twice the number' is represented by 2x so we have our equation:

2x-5^0.5=7

(5^0.5 is just square root 5 because I can't do a square root symbol.)

Now we need to isolate the x term so:

2x-5^0.5+5^0.5=7+5^0.5

2x=7+5^0.5

Square root 5 = 2.236 (3dp)

2x=7+2.236

2x=9.236

2x/2=9.236/2

x=4.618

Hope this helped!