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3 years ago

PLEASE HELP , I tried to learn but still don’t understand

Mathematics

1 answer:

Vadim26 [7]3 years ago

8 0

Answer:

(x -8)(x +3) = 0

Step-by-step explanation:

When a quadratic has the factorization

(x +a)(x +b) = 0

It expands to

x² +(a+b)x +ab = 0

When you compare this expansion to the given quadratic, you find that the numbers "a" and "b" must satisfy the requirements ...

a+b = -5 . . . . . . the coefficient of the x term

ab = -24 . . . . . . the constant term

Another way to say this is that you want to find two factors of -24 that have a sum of -5.

___

At this point, you make use of your knowledge of signed numbers and of multiplication tables. You know that for the product of two numbers to be negative, exactly one of them must be negative. In order for the sum to be negative, the factor with the largest magnitude must be negative.

Here are the ways -24 can be factored with the largest (magnitude) factor negative:

-24 = -24×1 = -12×2 = -8×3 = -6×4

The sums of the factors in these factor pairs are -23, -10, -5, -2. The one we're interested in is -8×3 with a sum of (-8 +3) = -5.

It does not matter which number (-8 or 3) is assigned to a or to b. It only matters that we now know the factored equation is ...

(x -8)(x +3) = 0

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Given the equation:

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(a) You can identify that the student applied the Subtraction Property of Equality by subtraction 3 from both sides of the equation:

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However, the student made a mistake when adding the numbers on the right side.

Since you have two numbers with the same sign on the right side of the equation, you must add them, not subtract them and use the same sign in the result. Then, the steps to add them are:

- Add their Absolute values (their values without the negative sign).

- Write the sum with the negative sign.

Then: