Ответ:
(4х+1)²-(4х-3)(4х+3)=42
(4х)²-2×4×х+1² - (4х)²-3²=42
16х²-8х+1 - 16х²-9=42
16х²-8х+1 - 16х²-9 - 42=0
-8х +1-9-42=0
-8х-50=0
-8х=50
х= 50/(-8)
х=6,25
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Answers & Comments
Ответ:
(4х+1)²-(4х-3)(4х+3)=42
(4х)²-2×4×х+1² - (4х)²-3²=42
16х²-8х+1 - 16х²-9=42
16х²-8х+1 - 16х²-9 - 42=0
-8х +1-9-42=0
-8х-50=0
-8х=50
х= 50/(-8)
х=6,25