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saw5 [17]
3 years ago
6

Sienna is solving the quadratic equation by completing the square.

Mathematics
2 answers:
VladimirAG [237]3 years ago
6 0

Answer:  The correct option is (C) 3.

Step-by-step explanation: Given that Sienna is solving the quadratic equation by completing the square as follows:

3x2+9x-4=0\\\\\Rightarrow 3x^2+9x=4\\\\\Rightarrow a(x^2+3x)=4.

We are given to find the find the value of a.

We can see that in the second step of Sienna's solution, 3 is common in both the terms, 3x2 and 9x.

So, she took 3 out and then in the third step, the expression within the bracket remais x^2+3x.

Therefore, the complete steps are as follows:

3x2+9x-4=0\\\\\Rightarrow 3x^2+9x=4\\\\\Rightarrow 3(x^2+3x)=4.

Hence, the value of a is 3.

Thus, (C) is the correct option.

kari74 [83]3 years ago
4 0
3x^2 + 9x - 4
3x^2 + 9x = 4
3(x^2 + 3x) = 4

Therefore, a = 3
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