ptrlvn01
29.07.2021 •
Mathematics
Which of the following expressions is equal to x2 +25?
O A. (x+10)(x-15)
O B. (x-51)(x+51)
OC.
-512
O D. (x+5)
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Ответ:
Solution given:
x²+25=???
we have
formula
a²+b²=(a+b)²-2ab or (a-b)²+2ab
so
x²+25 =x²+5²=(x+5)²-2x*5=(x+5)²-10x
or
x²+25=x²+5²=(x-5)²+2x*5=(x-5)²+10x
:.
expressions is equal to x² +25 is
(x-5)²+10x
or
(x+5)²-10x
Ответ:
option D
Step-by-step explanation:
option D is the correct answer .
plz mark my answer as brainlist.