7. Which of the following polynomials is the product of (2x + 5)(2x - 5)?
a. 4x2 + 25
b. 4x2 25
c. 4x2 + 20x - 25
d. 4x2 20x - 25
a. 4x2 + 25
b. 4x2 25
c. 4x2 + 20x - 25
d. 4x2 20x - 25
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Answer:
answer is B
Step-by-step explanation:
use the foil method
(2x)(2x)= 4x^2
(2x)(-5)= -10x
(5)(2x)= 10x
(5)(-5)= -25
= 4x^2 -10x+10x-25 ( combine like terms)
in this case its -10x+10x and it's equal to zero
so the final answer is 4x^2-25