Mathematics: Express x^2 + 4x - 7 in the form (x + a)^2 - b where a and b are intergers

Express x^2 + 4x - 7 in the form (x + a)^2 - b - id247213730992, lwattsstudent

jboii11

13.07.2021

x^2+4x-7=(x+4)^2-23 where a=4 and b=-23

Step-by-step explanation:

Given: x^2+4x-7

Complete the square: (x^2+4x+16)-23

Reduce trinomial: (x+4)^2-23

Therefore, x^2+4x-7=(x+4)^2-23 where a=4 and b=-23 .

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KallMeh

11.10.2022

64π in²

Step-by-step explanation:

The surface area (A) of a sphere is calculated as

A = 4πr² ( r is the radius, and here is 4 ), thus

A = 4π × 4² = 4π × 16 = 64π

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