l6illfemyukiynannag l6illfemyukiynannag

20-05-2016
Mathematics

Answered

Which equations are true for x = –2 and x = 2? Check all that apply.

A.x2 – 4 = 0

B.x2 = –4

C.3x2 + 12 = 0

D.4x2 = 16

E.2(x – 2)2 = 0

Verified Answer :

Mashuly Mashuly

20-05-2016

А. х²-4=0; х²=4; х=±2, true.

Bx²=-4; there is no solution.

C3x²+12=0; 3x²=-12; x²=-4; there is no solution.

D4x²=16; x²=4; x=±2, true.

E2(x-2)²=0; 2(x²-4x+4)=0; 2x²-8x+8=0; x²-4x+4=0; x1=2; x2=2. False. The answer: A, D.

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