Question

evaluate the following for a=4 and b=-5
a) a²+b²-ab
b) a³b+ab²
c) a-b/a+b+a-b
d)(a+b)²-(a-b)²
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Answer 1

Answer:

a) a²+b²-ab

(4²)+(-5)²-(4)(-5)

16+25+20

61

b) a³ b +ab²

(4)³(-5)+(4)(-5)²

-320+100

-220

c) a-b/a+b+a-b

a-b/2a

4-(-5)/2(4)

9/8

d) (a+b)²-(a-b)²

(4+(-5))²-(4-(-5))²

(-1)²-(1)²

1-1

0