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Q.

How do you solve x2 = 16 using the quadratic formula

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a

4, –4

b

–6, 6

c

–7, 8

d

–9, 10 

answer is A.

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Detailed Solution

⇒ x2 = 16
⇒ x2 – 16 = 0 …(i)
It lan be written. x2 – 16 + 0x = 0
Now
a = 1, b = 0, c = –16
Quadratic formula
x= −b± b 2 −4ac 2a   x= 0± (0) 2 −4(1)(−16) 2×1   = 4×4×4 2 ⇒± 8 2   x = ± 4
x = 4, x = –4
 
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