Question

if ab=20 and a=-5 what is the value of a^2-b^2

Answer 1

ab = 20

a = -5

so b = ???

Answer 2

b= -4

Answer 3

now that you know a = 5 and b = -4, you can compute a^2 - b^2

Answer 4

simply plug in those values and evaluate

Answer 5

answer= -9

Answer 6

close but no

Answer 7

i put it into my calculator and thats the answer i got'
what am i doing wrong?