Mathhater6
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Please Help me? 20 points!!!
x3 − 4x2 + 3x + 7 divided by (x + 5)
I'm studying for a quiz but I don't understand how to do this.
Please explain. Brainliest only will be given if it includes an explanation.
I will report you if you give some random answer just for the points, don't test me.

Respuesta :

ChoiSungHyun

Step-by-step explanation:

x³ - 4x² + 3x + 7

= (x + 5)(Ax² + Bx + C) + D

= Ax³ + (B + 5A)x²+ (C + 5B)x + (D + 5C).

By Comparing Coefficients, we have

A = 1

B + 5A = -4

C + 5B = 3

D + 5C = 7

Solving them, we have A = 1, B = -9, C = 48 and D = -233.

Hence x³ - 4x² + 3x + 7 = (x + 5)(x² - 9x + 48) - 233.

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