If the quadratic equation 2x2+px+2=0 has two equal real roots then one of the possible values of 'p' is
A
4
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B
2
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C
-2
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Solution
The correct option is A 4 Since the equation 2x2+px+2=0 has 2 equal real roots, its discriminant will be zero.
When you compare 2x2+px+2=0 to the standard form ax2+bx+c=0
we get , a =2,b =p and c = 2 ⇒D=b2−4ac=p2−4×2×2=0 ⇒p2−16=0 ⇒p2=16 ⇒p=+4or−4