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azamat
3 years ago
6

If x2 - 4 = 45, then x could be equal to 9 3 5 -7 -4

Mathematics
1 answer:
Ivanshal [37]3 years ago
5 0
Transpose the constant on the left hand side of the equation to the right side. The equation becomes x² = 45 + 4, 
                                               x² = 49
                                           x = sqrt(49) 
                                            x = 7 and x = -7
Only -7 is on the choices. Thus, the answer is x = -7.
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Answer:

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Step-by-step explanation:

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Step 1: Sum = - 16x

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Step 2: Find 2 numbers that their sum is -16 and their product is 60. If you do that correctly, then you will get two numbers: 10 and -6

Step 3: Replace -16x with the two numbers found in step 2, then you will have; 3x^2 - 6x - 10x + 20

Step 4: Factorise the equation in step 3, like so;

(3x^2 - 6x)(- 10x + 20)

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To check if the answer is correct, expand the bracket: (3x - 10)(x - 2)

If the bracket is opened properly, you will get 3x^2 - 16x + 20

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