Question

multiply (5a -2b) ^2

Answer 1

show me what you've tried

Answer 2

i got 25a^2 - 4b^2 but my options are:
a) 5a^2 -20ab -4b^2
b) 5a^2 + 20ab - 4b^2
c) 5a^2 + 20ab + 4b^2
d) 5a^2 - 20ab + 4b^2

Answer 3

i need to know what i should be doing to get an answer like that

Answer 4

(5a-2b)^2 = (5a-2b)(5a-2b)
try expand further

Answer 5

thank you