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b. -4

x2+20 = 4

x2 = 4-20

x2 = -16

x = -4

Note that -42 = -16 but (-4)2 in brackets = 16

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Q: X² plus 20 equals 4 a. square root of 24 b. -4 c. square root of 24 with a plus minus before it d. no real number ans.?
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