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kap26 [50]
3 years ago
9

Can you help with #21 please. I will mark Brainliest.​

Mathematics
2 answers:
Leokris [45]3 years ago
7 0

Answer:

A, C, E

Step-by-step explanation:

By analyzing the graph, we can see that the roots are -2 and -4.

We now want to find all equations of the form (x-(-2))(x-(-4))=(x+2)(x+4)=0.

This immediately gives C as 1 answer.

We can expand our equation to find other possible solutions!

By the FOIL method: (x+2)(x+4)=(x)(x)+(2)(x)+(4)(x)+(2)(4)=x^2+6x+8=0

We can then divide both sides of the equation to find that -x^2-6x-8=0, so A is another answer.

We can complete the square on x^2+6x+8 to find the last possible solution.

x^2+6x+8=x^2+6x+9-9+8=x^2+6x+9-1=(x+3)^2-1=0.

We can then multiply both sides of the equation by 4 to find that 4(x+3)^2-4=0, so E is the last answer.

The proof that the other answers don't work is left as an exercise.

So, the answers are A, C, and E, and we're done!

tamaranim1 [39]3 years ago
4 0

Answer:

its going to be letter b  because  2 and  4 well the x intercepts those  

Step-by-step explanation:

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