Question

evaluate -4(a+b)-10a/b when a=8 and b=5

Answer 1

Simplify the following:
-4 (8+5)-10×8/5
Evaluate 8+5.
8+5 = 13:
-413-10×8/5
Multiply -4 and 13 together.
-4×13 = -52:
-52-10×8/5
Multiply -10 and 8 together.
-10×8 = -80:
-80/5-52
Reduce (-80)/5 to lowest terms.
The gcd of -80 and 5 is 5, so (-80)/5 = (5 (-16))/(5×1) = 5/5×-16 = -16:
-16-52
Group the negative terms in -52-16 together and factor out the minus sign.
-52-16 = -(52+16):
-(52+16)
Evaluate 52+16 using long addition.
| 5 | 2
+ | 1 | 6
| 6 | 8:
Answer: |
| -68

Answer 2

-4(a+b) - (10a)/b
= -4(8+5) - (10x8)/5
= (-4x13) - (80/5)
= -52 -16
= -68

Answer 3

First get an easyer problem from this way :!
first : -4(a+b) = -4a-4b
Then :-10a/b = -10a/b
Now we have : -4a-4b-10a/b
Now give the numbers :
-4(8)-4(5)-10(8)/5
So we have : -32-20-80/5
: -32-20-16
:-4
Understond ?