savera49 savera49

08-07-2016
Mathematics

contestada

Solve x2 + 8x = 24.

A. -4 plus or minus 2 sq root of 2
B. -4 plus or minus 2 sq root of 10
C. -4 plus or minus 2 sq root of 5
D. -4 plus or minus 2 sq root of 7

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TheChunkyLion TheChunkyLion

08-07-2016

so is it square root or squared?

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08-07-2016

Hello,

x²+8x-24=0
Δ=8²+4*24=160
==>x=(-8-4√10)/2=-4-2√10 or x=-4+2√10
Answer B

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