Answer:
2x⁴ - 20x² - 78
To factor the expression look for the LCM of the numbers
LCM of the numbers is 2
Factorize that one out
That's
2( x⁴ - 10x² - 39)
Hope this helps
2x + 4x - 21 = 0
6x - 21 = 0
6x = 21
x=3.5
Well it would be 63$ if we are not including tax because 80-17=63
It’s the first one -13–16
4 to 7
or
4+7= 12
4x+7x=33
x=3
so,
(4×3)+(7×3)=33
12+21=33
or
12 and 21.
hope it helped