Why did u spread that so much
1/4-3/7*7/8 = 1/4 - 3/8 = 2/8 - 3/8 = -1/8
Your answer is about 25. A
If the number is n then
square of 2 times a number
square of 2n
(2n)²
that was your mistake, because (2n)²=4n², not 2n²
the result is 81
(2n)²=81
square root both sides
remember positive and negative roots
2n=+/-9
divide by 2
n=+/-4.5
n=4.5 or -4.5
