Answer:
1368
Step-by-step explanation:
1. Multiplication is first. (-18) x 72 is -1296.
2. 72 - (-1296) is the same as 72 + 1296.
72 + 1296 = 1368
x1 = 8+√10, x2 = 8 -√10
x² - 16x + 54 = 0
<ABC = 15
< BAC = 150
<C = <B since this is an isosceles triangle. We know this because AC = AB
<C = 15 so <ABC = 15
The sum of the angles of a triangle is 180
A + B+ C = 180
A + 15+15 = 180
A +30 =180
A = 180-30
A = 150
