U1 . U3 = U2 . U2
(5p + 14) . 3p = (4p + 4) . (4p + 4)
15p² + 42p = 16p² + 32p + 16
15p² - 16p² + 42p - 32p - 16 = 0
-p² + 10p - 16 = 0
p² - 10p + 16 = 0
(p - 2) . (p - 8) = 0
p - 8 = 0
p = 8
p - 2 = 0
p = 2
Ut² = a.Un
(4p+4)² = 3p(5p+14)
16p²+32p+16 = 15p²+42p
(16-15)p²+(32-42)p+16=0
p²-10p+16=0
(p-8)(p-2)=0
p=8 atau p=2 (B)
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U1 . U3 = U2 . U2
(5p + 14) . 3p = (4p + 4) . (4p + 4)
15p² + 42p = 16p² + 32p + 16
15p² - 16p² + 42p - 32p - 16 = 0
-p² + 10p - 16 = 0
p² - 10p + 16 = 0
(p - 2) . (p - 8) = 0
p - 8 = 0
p = 8
p - 2 = 0
p = 2
Ut² = a.Un
(4p+4)² = 3p(5p+14)
16p²+32p+16 = 15p²+42p
(16-15)p²+(32-42)p+16=0
p²-10p+16=0
(p-8)(p-2)=0
p=8 atau p=2 (B)
semoga membantu