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OloloshaOloloeva
@OloloshaOloloeva
July 2022
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Решите уравнение:
а)6m^2-(2m-1)^2=m(m+4)
б)(3a+1)^2-10=(a+3)(a-3)
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lazybone305
Verified answer
А)
6m² - (2m-1)² = m(m+4)
6m²- (4m² + 1 - 4m ) = m²+4m
6m²- 4m² - 1 + 4m - m² - 4m = 0
m² =1
m = 1 или -1
б)
(3a+1)² - 10=( a+3)(a-3)
9a² + 1 + 6a - 10 = a² - 9
9a² + 1 + 6a - 10 - a² + 9 = 0
8a² + 6a = 0
a(8a + 6) = 0
a = 0 или 8a + 6 = 0
8a = -6
a = -6/8
a = -3/4
3 votes
Thanks 3
OloloshaOloloeva
Спасибо большое)))
virmarusja
а как получили а^2 - 9??? Можно с этого места по-подробнее)
virmarusja
вру
virmarusja
9a^2 - 1
virmarusja
9a^2+1 точнее, извиняюсь за такую фигну с невнимательностью
lazybone305
есть формула (a + b)^2 = a^2 + b^2 + 2ab
lazybone305
(3a+1)² = (3a)² + 1² + 2*3a*1 = 9a² + 1 + 6a
virmarusja
1 votes
Thanks 1
lazybone305
6m² - 4m² - m² = m²
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Answers & Comments
Verified answer
А)6m² - (2m-1)² = m(m+4)
6m²- (4m² + 1 - 4m ) = m²+4m
6m²- 4m² - 1 + 4m - m² - 4m = 0
m² =1
m = 1 или -1
б)
(3a+1)² - 10=( a+3)(a-3)
9a² + 1 + 6a - 10 = a² - 9
9a² + 1 + 6a - 10 - a² + 9 = 0
8a² + 6a = 0
a(8a + 6) = 0
a = 0 или 8a + 6 = 0
8a = -6
a = -6/8
a = -3/4