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ipn [44]
3 years ago
15

What are the solutions to the equation? 3x^2+6x=45 Enter your answers in the boxes.

Mathematics
2 answers:
maksim [4K]3 years ago
8 0

Answer:

Step-by-step explanation:

3x² +6x = 45

divid by : 3 :

x² +2x = 15

(x² +2x +1 )-16 = 0

( x + 1 )² - 4² = 0

note : a² - b² = (a - b ) ( a + b)  ...idetity

( x +1 -4)( x + 1 +4) = 0

(x -3 ) ( x+5) =0

x-3 = 0 or x +5 = 0

x = 3  or x = - 5

my answer in the boxes :   x = 3 and x = -5

Gnoma [55]3 years ago
5 0

x= 3,-5

hope this helps

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