hibrar917 hibrar917
  • 28-01-2021
  • Mathematics
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Express x^2 + 4x - 7 in the form (x + a)^3 - b where a and b are integers

Express x2 4x 7 in the form x a3 b where a and b are integers class=

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DWRead
DWRead DWRead
  • 28-01-2021

Answer:

(x+2)² - 11

Step-by-step explanation:

Regroup terms

x² + 4x - 7

(x² + 4x) - 7

Complete the square

 coefficient of x term: 4

 divide coefficient in half: 2

 square it: 2²

 use 2² to complete the square:

(x² + 4x) - 7 = (x² + 4x + 2²) - 2² - 7 = (x+2)² - 11

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