Answer:
+or- 8
Step-by-step explanation:
take the square root of 64
First set everything to 0.

Giving you A= 1 , B= 1 and C= -5
Then input everything into the quadratic formula and either solve by hand or use a calculator.
Note exact values are found by hand, decimals are found using a calculator.
He had 160$ when he first started
Standard Form: 79,031
Expanded Form: 70,000 + 9,000 + 30 + 1